Hello All
I am trying to figure my dash wiring. I have a wiring manual but it dosen't tell me what color wires go on what pin on the back of my switches. Does anyone have a better diagram or pictures or something that can help me figure out what color wires go on what pegs in the pack of the switch? Thanks
Quote from: Jcparmley on August 08, 2018, 07:05:54 PM
Hello All
I am trying to figure my dash wiring. I have a wiring manual but it dosen't tell me what color wires go on what pin on the back of my switches. Does anyone have a better diagram or pictures or something that can help me figure out what color wires go on what pegs in the pack of the switch? Thanks
First off, Do you have the complete set of wiring diagrams? second, what year and unit number is yours? This plays a role in determining what resources can be used.
Do you have any pictures as well? They are useful for matching diagrams
My MCI has all black wiring and each is labeled with a metal tag with the circuit number stamped on. Did they change that by your generation of bus?
Quote from: bevans6 on August 09, 2018, 04:11:40 AM
My MCI has all black wiring and each is labeled with a metal tag with the circuit number stamped on. Did they change that by your generation of bus?
My D is colored and numbered all firggin pins and plugs with 8 pages of schematics
I purchased a pdf manual and wiring diagrams. My bus is a 1989 MCI 102c3.
Quote from: jraynor on August 09, 2018, 03:30:33 AM
First off, Do you have the complete set of wiring diagrams? second, what year and unit number is yours? This plays a role in determining what resources can be used.
Do you have any pictures as well? They are useful for matching diagrams
1989 TMC 102C3, #7417, lvmci...
Quote from: Jcparmley on August 09, 2018, 06:55:48 AM
I purchased a pdf manual and wiring diagrams. My bus is a 1989 MCI 102c3.
So i plan replace all of my switches as some are broken, some are different types etc. I have had to stare through countless diagrams to find what i am looking for. Some of the stuff is pretty basic understanding of how the switch operates (SPST, SPDT, DPST, DPDT) and then to find which is hot. From the diagrams, you can follow the circuits to where it will have a >#>. This will be the pin in the harness plug. It will also have a P# above it as well which tells you the plug number. you may be lucky and might be able to match your dash to the Group C Diagrams. This will tell you the plug numbers and should also show you what each panel has, and show you the pins that each plug has and some color coding as well. Mine was modified afterwards so the diagrams that are available now show more than what mine have in it so they arent that "correct" so to say.
See the picture: I colored the switches Yellow, the P-4 connector Blue and the P-5 connector Green. This is from the master schematic which for your 102c it depends on which which unit# yours is will either be drawings 11-A4 through 11-A6 or 11-A7 through 11-A9. The only difference may be the defrost but im not sure.
If the circuit is something specific that you are working, i.e. the headlamps, then you can find that specific drawing and possibly get more information.
Either way, it is a combination of Group C drawings, master drawings or specific drawings, and knowing how the switch operates/trail and error.
There is another post on unit number. I found mine at the end of the VIN and stamped on the front wall of the first cargo bay near the center return duct. not 100% sure that this is the unit number or not still
Which switch are you trying to figure out?
I bought all new panels and switches for my D from Sam they were pretty much plug and play till I got to the fast idle, cruise and kneeling that part took me 2 weeks :o
Quote from: luvrbus on August 09, 2018, 07:36:54 AM
I bought all new panels and switches for my D from Sam they were pretty much plug and play till I got to the fast idle, cruise and kneeling that part took me 2 weeks :o
Were they a new set for a D or a used set? i assume used. But Sam no longer has parts for any 102A series. Do you still have you old panels?
They were new Sam had them stashed away,I gave the old panels to a friend of mine that wanted all the switches for his C
Here is what my wire schematic looks like. It dosen't tell me what color goes to what pin on the back of the switch.
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2FMCI%2520Wiring_zpsignl4gq9.jpg&hash=c98497de18079ce2553050741f21c5775cdc993d) (http://s1299.photobucket.com/user/pastorjared/media/MCI%20Wiring_zpsignl4gq9.jpg.html)
Quote from: Jcparmley on August 09, 2018, 06:55:48 AM
I purchased a pdf manual and wiring diagrams. My bus is a 1989 MCI 102c3.
Quote from: Jcparmley on August 09, 2018, 09:51:05 AM
Here is what my wire schematic looks like. It dosen't tell me what color goes to what pin on the back of the switch.
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2FMCI%2520Wiring_zpsignl4gq9.jpg&hash=c98497de18079ce2553050741f21c5775cdc993d) (http://s1299.photobucket.com/user/pastorjared/media/MCI%20Wiring_zpsignl4gq9.jpg.html)
First issue you have there is that the I-2 drawings goes to the 96B3 and 102A3 Models. Be sure to match the drawing application to your bus before you get too deep in the drawing. You need Drawing C-I-6 and C-I-7. I don't even have page 6 in my set
Are those schematics not faithful to the orientation of the switch connections?
Those diagrams should look just like the back of the switches.
Check the non-symetrical one to confirm if you are looking thru the switch from the front, or looking at it from the back.
This is a test of your spacial awareness, and other high falutin' brain/eye functioning.
Alzheimers? It's ok, you already forgot so you won't feel bad.
happy coaching!
buswarrior
hey guys I got a silly assed question about that panel does anyone know where I can get one for my 1988 102A3? the pervious owner removed it before I got the bus and he couldn't find it or tell me why he removed it....its for the cruise dash lights ect any information would be GREATLY appreciated I do have a call into Luke @ US coach so maybe he has one haven't heard back yet...thanks again
hey guys I got a silly assed question about that panel does anyone know where I can get one for my 1988 102A3? the pervious owner removed it before I got the bus and he couldn't find it or tell me why he removed it....its for the cruise dash lights ect any information would be GREATLY appreciated I do have a call into Luke @ US coach so maybe he has one haven't heard back yet...thanks again
oops should only click once sorry
Quote from: dj on August 10, 2018, 06:45:01 PM
hey guys I got a silly assed question about that panel does anyone know where I can get one for my 1988 102A3? the pervious owner removed it before I got the bus and he couldn't find it or tell me why he removed it....its for the cruise dash lights ect any information would be GREATLY appreciated I do have a call into Luke @ US coach so maybe he has one haven't heard back yet...thanks again
Which panel? I'm redoing all of mine from my 1986 102A3. I think the differences may include the defroster is a 4 position rotary knob where mine is just a 2 speed and I think yours may have the bulb test switch where mine doesnt
I don't even have C-I-6. Is there a different schematic that I could purchase? Perhaps one that shows which wires go to which pins on the back of the switch?
Quote from: jraynor on August 09, 2018, 10:23:14 AM
First issue you have there is that the I-2 drawings goes to the 96B3 and 102A3 Models. Be sure to match the drawing application to your bus before you get too deep in the drawing. You need Drawing C-I-6 and C-I-7. I don't even have page 6 in my set
Quote from: Jcparmley on August 11, 2018, 09:05:30 AM
I don't even have C-I-6. Is there a different schematic that I could purchase? Perhaps one that shows which wires go to which pins on the back of the switch?
I would give MCI a call and ask for the missing diagram. Just call them and have your last 5 of your Vin and talk with their technical team. They will send it to you. Not sure about if they have a schmatica that says which wire goes to each pin. I have noticed in the master that shows some of the pin numbers. Basically do this, say ok I need to know about the cruise switch, look at the beginning of the electrical schematics in the table of contents and find the section on cruise control. Then go to that section, find the switch and see if it shows the pin numbers. If it doesn't, the circuits aren't to difficult to trace the path that the voltage follows. I.e, the power comes in on one leg, and when the switch closes, goes to the item (light,motor,etc.). Then power up the coach, then use a volt meter to determine which wire is hot then go from there.
The master schematic and others do show what pin# out of the plug of the harness each wire is as well. But some are more clear than others so check multiple schematics.
There is also the chance that someone modified something to make it work for them. That would make things worse. Like my bus, I have an extra cruise switch and I have no clue what it controls.
I called MCI about the missing diagram and they said they don't have one. Their book looks just like my PDF. So I went ahead and installed all the gauges and switches and I have no power when I turn on the master switch. So I must be missing something. My guess is the 24 volt post on the back of the dash gauge panel is not getting power, therefore nothing is getting power. Does anyone know which wire is the main power from the batteries? Thanks
Quote from: jraynor on August 11, 2018, 09:48:03 AM
I would give MCI a call and ask for the missing diagram. Just call them and have your last 5 of your Vin and talk with their technical team. They will send it to you. Not sure about if they have a schmatica that says which wire goes to each pin. I have noticed in the master that shows some of the pin numbers. Basically do this, say ok I need to know about the cruise switch, look at the beginning of the electrical schematics in the table of contents and find the section on cruise control. Then go to that section, find the switch and see if it shows the pin numbers. If it doesn't, the circuits aren't to difficult to trace the path that the voltage follows. I.e, the power comes in on one leg, and when the switch closes, goes to the item (light,motor,etc.). Then power up the coach, then use a volt meter to determine which wire is hot then go from there.
The master schematic and others do show what pin# out of the plug of the harness each wire is as well. But some are more clear than others so check multiple schematics.
There is also the chance that someone modified something to make it work for them. That would make things worse. Like my bus, I have an extra cruise switch and I have no clue what it controls.
Quote from: Jcparmley on August 14, 2018, 10:15:54 AM
I called MCI about the missing diagram and they said they don't have one. Their book looks just like my PDF. So I went ahead and installed all the gauges and switches and I have no power when I turn on the master switch. So I must be missing something. My guess is the 24 volt post on the back of the dash gauge panel is not getting power, therefore nothing is getting power. Does anyone know which wire is the main power from the batteries? Thanks
Looking at the wiring diagram for a 102C3, group 11 master schematic, I would do the following:
1. Turn on your 12v and 24v battery disconnect.
2. Walk over and open your front junction box. Measure 12 volts at the front junction box 12v bus bar, specifically stud 81 with the 20Amp. (Decals that show where everything is in Group A either drawing A-B2 or A-B3)
- If no voltage, the follow cable BL to your 12V main disconnect switch. If no power at the 12v Main disconnect, follow it to Vanner #1. If no power there, follow it to your middle battery tap. If no voltage there, then the issue is the battery.
- If you do get 12v, go to 3
3. Measure 24v from your front junction box 24v bus bar, specifically stud 37 with the 3Amp.
- If no voltage, follow cable BK to your 24v battery bus bar in your A/C junction box. the 105Amp stud should read 24v. If no voltage, follow cable BK-1/0 (its size) to 24v main disconnect. If no voltage from there, follow the 4/0 wire to the battery. If no voltage, Its the batteries not providing 24v.
- If you do get 24v, got to step 4
4. Standing from the outside of the drivers side window, with the electrical box open, Turn on the master switch by reaching through the window. Do you hear a contact block close?
Report back with the results and if you reach step 4 succesfully
I must be an idiot but forgive me for asking which is the front junction box? I have 24 volts coming off of the battery. Is the front junction box the one under a drivers side window? If so I can't find stud 81.
Quote from: jraynor on August 14, 2018, 10:27:16 AM
Looking at the wiring diagram for a 102C3, group 11 master schematic, I would do the following:
1. Turn on your 12v and 24v battery disconnect.
2. Walk over and open your front junction box. Measure 12 volts at the front junction box 12v bus bar, specifically stud 81 with the 20Amp. (Decals that show where everything is in Group A either drawing A-B2 or A-B3)
- If no voltage, the follow cable BL to your 12V main disconnect switch. If no power at the 12v Main disconnect, follow it to Vanner #1. If no power there, follow it to your middle battery tap. If no voltage there, then the issue is the battery.
- If you do get 12v, go to 3
3. Measure 24v from your front junction box 24v bus bar, specifically stud 37 with the 3Amp.
- If no voltage, follow cable BK to your 24v battery bus bar in your A/C junction box. the 105Amp stud should read 24v. If no voltage, follow cable BK-1/0 (its size) to 24v main disconnect. If no voltage from there, follow the 4/0 wire to the battery. If no voltage, Its the batteries not providing 24v.
- If you do get 24v, got to step 4
4. Standing from the outside of the drivers side window, with the electrical box open, Turn on the master switch by reaching through the window. Do you hear a contact block close?
Report back with the results and if you reach step 4 succesfully
Quote from: Jcparmley on August 14, 2018, 04:09:31 PM
I must be an idiot but forgive me for asking which is the front junction box? I have 24 volts coming off of the battery. Is the front junction box the one under a drivers side window? If so I can't find stud 81.
Yes, the front junction box is under the driver's window. Check out group A drawing B3. I assume this is yours being a C3 but you will have to check it against yours. If anything, take a picture of your junction box and send it in your next post
See the image below, I pointed out where 88 is near
My junction box is group A drawing B2 and only has 65 studs. I will take a pic tomorrow and send it to you in the next post. Thanks for your help.
Quote from: jraynor on August 14, 2018, 04:21:00 PM
Yes, the front junction box is under the driver's window. Check out group A drawing B3. I assume this is yours being a C3 but you will have to check it against yours. If anything, take a picture of your junction box and send it in your next post
See the image below, I pointed out where 88 is near
ok so you have an older model 102C3 then. They seemed to have changed from a 65 stud to 100 stud at some point.
I was partially misleading you as well. The 81 is from the bus bar not a stud, But Im unable to locate your 12v bus bar. Use this method:
1. Turn on your 12v and 24v battery disconnect.
2. Walk over and open your front junction box. Measure 12 volts at the front junction box 12v bus bar, just measure the voltage found on each bus bar until you find 12 (Decals that show where everything is in Group A either drawing A-B2 or A-B3)
?If no voltage, the follow cable BL to your 12V main disconnect switch. If no power at the 12v Main disconnect, follow it to Vanner #1. If no power there, follow it to your middle battery tap. If no voltage there, then the issue is the battery.
?If you do get 12v, go to 3
3. Measure 24v from your front junction box 24v bus bar, just measure the voltage found on each bus bar until you find 24V. There may be multiple 24v bus bars
?If no voltage, follow cable BK to your 24v battery bus bar in your A/C junction box. the 105Amp stud should read 24v. If no voltage, follow cable BK-1/0 (its size) to 24v main disconnect. If no voltage from there, follow the 4/0 wire to the battery. If no voltage, Its the batteries not providing 24v.
?If you do get 24v, got to step 4
4. Standing from the outside of the drivers side window, with the electrical box open, Turn on the master switch by reaching through the window. Do you hear a contact block close?
Report back with the results and if you reach step 4 successfully
Ive attached a photo showing what the bus bars should look like, youll also see my main power cable as well. I would image that you should be able to get to step 4 above unless your batteries are your issue.
Ok, I will check that out this afternoon when I can get out to the bus. My batteries are less than a year old. Also, when I turn on the main switch at the battery bay my lights, radio, turn signals, etc work just fine. It's just my dash seems to have no power so I can't start the bus. Strange. I think there must be a power wire that is disconnected somewhere.
Quote from: jraynor on August 15, 2018, 04:12:15 AM
ok so you have an older model 102C3 then. They seemed to have changed from a 65 stud to 100 stud at some point.
I was partially misleading you as well. The 81 is from the bus bar not a stud, But Im unable to locate your 12v bus bar. Use this method:
1. Turn on your 12v and 24v battery disconnect.
2. Walk over and open your front junction box. Measure 12 volts at the front junction box 12v bus bar, just measure the voltage found on each bus bar until you find 12 (Decals that show where everything is in Group A either drawing A-B2 or A-B3)
?If no voltage, the follow cable BL to your 12V main disconnect switch. If no power at the 12v Main disconnect, follow it to Vanner #1. If no power there, follow it to your middle battery tap. If no voltage there, then the issue is the battery.
?If you do get 12v, go to 3
3. Measure 24v from your front junction box 24v bus bar, just measure the voltage found on each bus bar until you find 24V. There may be multiple 24v bus bars
?If no voltage, follow cable BK to your 24v battery bus bar in your A/C junction box. the 105Amp stud should read 24v. If no voltage, follow cable BK-1/0 (its size) to 24v main disconnect. If no voltage from there, follow the 4/0 wire to the battery. If no voltage, Its the batteries not providing 24v.
?If you do get 24v, got to step 4
4. Standing from the outside of the drivers side window, with the electrical box open, Turn on the master switch by reaching through the window. Do you hear a contact block close?
Report back with the results and if you reach step 4 successfully
Ive attached a photo showing what the bus bars should look like, youll also see my main power cable as well. I would image that you should be able to get to step 4 above unless your batteries are your issue.
Quote from: Jcparmley on August 15, 2018, 08:12:24 AM
Ok, I will check that out this afternoon when I can get out to the bus. My batteries are less than a year old. Also, when I turn on the main switch at the battery bay my lights, radio, turn signals, etc work just fine. It's just my dash seems to have no power so I can't start the bus. Strange. I think there must be a power wire that is disconnected somewhere.
you saw main switch, as in singular. Do you not have 2 main switches? By the look of the diagram, it seems that you have a 12v and a 24v main switch. the 12v switch powers the main contact that provides the 24v to everything else.
When you turn the 24V on, do you hear a buzzer in the bottom right of your front junction box?
What year is your bus?
I have a 1989 MCI 102c3. I have one main switch at the batteries. When I turn on the master switch at the dashboard I hear nothing. When I flip the engine start nothing happens. I do not hear a buzzer.
Quote from: jraynor on August 15, 2018, 08:51:08 AM
you saw main switch, as in singular. Do you not have 2 main switches? By the look of the diagram, it seems that you have a 12v and a 24v main switch. the 12v switch powers the main contact that provides the 24v to everything else.
When you turn the 24V on, do you hear a buzzer in the bottom right of your front junction box?
What year is your bus?
Quote from: Jcparmley on August 15, 2018, 09:13:33 AM
I have a 1989 MCI 102c3. I have one main switch at the batteries. When I turn on the master switch at the dashboard I hear nothing. When I flip the engine start nothing happens. I do not hear a buzzer.
What is the last 5 of your vin? And do you have a Dual Vanner Setup? Im trying to match your coach to a drawing
The last 5 of my vin is 42724. I will look for the Dual Vanner when I get out to the bus. Thank you so very much for your help.
Jared
Quote from: jraynor on August 15, 2018, 09:24:22 AM
What is the last 5 of your vin? And do you have a Dual Vanner Setup? Im trying to match your coach to a drawing
Quote from: Jcparmley on August 15, 2018, 10:47:46 AM
The last 5 of my vin is 42724. I will look for the Dual Vanner when I get out to the bus. Thank you so very much for your help.
Jared
While you are at it, See if you have a 12v main disconnect switch as well. The drawing closest to your coach shows a 12v and 24v
Would that be located near the main switch in the battery box? I just sent you a pm with my email. That might be easier to communicate.
Quote from: jraynor on August 15, 2018, 12:51:53 PM
While you are at it, See if you have a 12v main disconnect switch as well. The drawing closest to your coach shows a 12v and 24v
I only have one main disconnect switch. Here are some pics of my front panel and the battery switch.
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_172215_zpsjbgactl1.jpg&hash=30f6bb84d77b972a2142b16845a31b6af7d49fd1) (http://s1299.photobucket.com/user/pastorjared/media/20180815_172215_zpsjbgactl1.jpg.html)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_1721521_zpspylta9o2.jpg&hash=f5f070d9dd3133177f920058713f7f73fe6528a0) (http://s1299.photobucket.com/user/pastorjared/media/20180815_1721521_zpspylta9o2.jpg.html)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_172149_zpsmtexvddl.jpg&hash=be90bfe0fd4296864c39e9b2db78f92cc05ec954) (http://s1299.photobucket.com/user/pastorjared/media/20180815_172149_zpsmtexvddl.jpg.html)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_172200_zpsxwinqwdc.jpg&hash=5d4317ba49042c3e2236c66203d0781aba7cc4d0) (http://s1299.photobucket.com/user/pastorjared/media/20180815_172200_zpsxwinqwdc.jpg.html)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_172155_zps2abiau34.jpg&hash=bd73989d287a0020cba79c394db9de921a44d5f0) (http://s1299.photobucket.com/user/pastorjared/media/20180815_172155_zps2abiau34.jpg.html)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_172432_zpsmvdbhlak.jpg&hash=214f678186d848cbd492f9a55a24df53a65b01cb) (http://s1299.photobucket.com/user/pastorjared/media/20180815_172432_zpsmvdbhlak.jpg.html)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_172442_zpsn093fk2o.jpg&hash=4a7dd942fdce76551c4fffe3844a48db1f64fe41) (http://s1299.photobucket.com/user/pastorjared/media/20180815_172442_zpsn093fk2o.jpg.html)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_172500_zpsakt2iaiw.jpg&hash=e98765ee9a0cc352d87da608246425281dfdcf26) (http://s1299.photobucket.com/user/pastorjared/media/20180815_172500_zpsakt2iaiw.jpg.html)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_172505_zpsuufwwxwo.jpg&hash=758ce7d66e2c0fa767b5c3c256d9841b20c773fe) (http://s1299.photobucket.com/user/pastorjared/media/20180815_172505_zpsuufwwxwo.jpg.html)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fi1299.photobucket.com%2Falbums%2Fag79%2Fpastorjared%2F20180815_172512_zpsamvni5vu.jpg&hash=c38b5d5e3e14bebe05ca3bb708ee3521b623cbf5) (http://s1299.photobucket.com/user/pastorjared/media/20180815_172512_zpsamvni5vu.jpg.html)
Quote from: jraynor on August 15, 2018, 12:51:53 PM
While you are at it, See if you have a 12v main disconnect switch as well. The drawing closest to your coach shows a 12v and 24v
Hi Jraynor
I am working on this problem again. I have just been starting the bus from a switch I installed at the starter when I put a new starter in last fall. Anyhow, I do have power at main disconnect, the vanner, and the 12v and 24 v buss bar. However, I have no power to the dash, the master switch, or the rear engine start control panel.
Quote from: jraynor on August 15, 2018, 04:12:15 AM
ok so you have an older model 102C3 then. They seemed to have changed from a 65 stud to 100 stud at some point.
I was partially misleading you as well. The 81 is from the bus bar not a stud, But Im unable to locate your 12v bus bar. Use this method:
1. Turn on your 12v and 24v battery disconnect.
2. Walk over and open your front junction box. Measure 12 volts at the front junction box 12v bus bar, just measure the voltage found on each bus bar until you find 12 (Decals that show where everything is in Group A either drawing A-B2 or A-B3)
?If no voltage, the follow cable BL to your 12V main disconnect switch. If no power at the 12v Main disconnect, follow it to Vanner #1. If no power there, follow it to your middle battery tap. If no voltage there, then the issue is the battery.
?If you do get 12v, go to 3
3. Measure 24v from your front junction box 24v bus bar, just measure the voltage found on each bus bar until you find 24V. There may be multiple 24v bus bars
?If no voltage, follow cable BK to your 24v battery bus bar in your A/C junction box. the 105Amp stud should read 24v. If no voltage, follow cable BK-1/0 (its size) to 24v main disconnect. If no voltage from there, follow the 4/0 wire to the battery. If no voltage, Its the batteries not providing 24v.
?If you do get 24v, got to step 4
4. Standing from the outside of the drivers side window, with the electrical box open, Turn on the master switch by reaching through the window. Do you hear a contact block close?
Report back with the results and if you reach step 4 successfully
Ive attached a photo showing what the bus bars should look like, youll also see my main power cable as well. I would image that you should be able to get to step 4 above unless your batteries are your issue.
https://m.delcity.net/store/Heavy!Duty-Disconnect-Switch/p_4873.h_169051