Master switch no power

[Jcparmley]

Here is my diagram I am trying to work off of.  I believe the problem is I don't have or can't find the brown 29p wire.  Here is a pic of the type of wiring the PO did.  Ridiculous

Let me look. Should be 2 or 3 wire codes, but I have a wonderful old school button. The wire codes should be the same.

The following is what I have. BEFORE YOU DO ANYTHING...TAKE PICTURES OF EVERY WIRE BEFORE YOU MOVE IT    Remember...you drove it home.
EDIT:
My schematic has 2 red code 29 wires on it. One of them goes from FRONT STUD #4 to the button; the other goes from the other side of the button to the MIDDLE pin on the master start switch, OVER black wire #3.
Wire id 3 goes from STUD #14 to the right side of the master switch, then to a 30 amp breaker in the FRONT junction box.

So, MASTER SWITCH: one wire id 3 on one side...2 wires id 3 and id 29 on the other.  But this stuff is getting familiar to you now.

Can you post your "Charging and Starting" diagram?

START BUTTON: 2 wires, both id 29. One getting power from stud 4, the other moving on to the master switch.

[buswarrior]

These schematics... are they EXACTLY the correct ones for your EXACT coach?

Just checking... the revisions and updates to certain circuits, there are a lot of schematics of the same things, but apply to different unit numbers/VINS.

You must use the correct one, or into the mud we shall go!

happy coaching!
buswarrior

[daddysgirl]

OK.
This might sound strange, but it saved my butt a couple of times.
Code 29 is the start circuit throughout the bus. Go to the junction box,take a picture before you do anything...then... locate wire 29 on stud #4. Remove the little nut remove the wire and GENTLY tug on it while looking at that harness through the drivers window. When you see a wire move, you've got it. It might be spliced to one of the wires in the picture.

Do the same for the wires on stud 14.

When you find individual wires, write down what stud they are on as well as what color they are at the switch.

Do you have to turn on your step light to start the bus?

[Jcparmley]

MCI said these are the closest to my coach as they have. 

These schematics... are they EXACTLY the correct ones for your EXACT coach?

Just checking... the revisions and updates to certain circuits, there are a lot of schematics of the same things, but apply to different unit numbers/VINS.

You must use the correct one, or into the mud we shall go!

happy coaching!
buswarrior

[daddysgirl]

Holy $#!%. (sorry, but no other word works)
I just noticed the pic of the wires behind the dash.

If you're going to undo all of that, you are going to need someone there with you. That's a two person adventure.


EDIT: Actually, it looks to me like each one of those bundles might be a mini harness for the individual switches. If that's the case, it's not so bad at all, and you shouldn't need to mess with them other than to ID the little groups of wires.

[Jcparmley]

I tried to follow the wires but they were all in cased in black wrap and sent to the dash.  Ai have been unable to find it in the dash once it was wrapped in the black wire wrap.  The PO spliced in two wires on the green #4 wire and on the Black #3R wire.  The splices weren't attached to anything.  I took a pic of these wires.

Couldn't I just attach another wire on the 14 stud and run it up to the switch?  Or run wire directly from the starter solenoid to the switch and bypass whatever the PO did?

OK.
This might sound strange, but it saved my butt a couple of times.
Code 29 is the start circuit throughout the bus. Go to the junction box,take a picture before you do anything...then... locate wire 29 on stud #4. Remove the little nut remove the wire and GENTLY tug on it while looking at that harness through the drivers window. When you see a wire move, you've got it. It might be spliced to one of the wires in the picture.

Do the same for the wires on stud 14.

When you find individual wires, write down what stud they are on as well as what color they are at the switch.

Do you have to turn on your step light to start the bus?

[daddysgirl]

MCI said these are the closest to my coach as they have.

For some reason, I can't get the diagram clear enough to see the wire ID's...is there a way I can make it more clear?

[Jcparmley]

Is this better.

For some reason, I can't get the diagram clear enough to see the wire ID's...is there a way I can make it more clear?

[daddysgirl]

Yes, much better. Let's see what it says...

[daddysgirl]

I think it will be easiest to understand if we have a system to number the pin positions. For example: The Master Switch top to bottom.. Left side L1, L2 etc...right side R1, R2 etc..does that make sense to you looking at everything actually?

[Jcparmley]

Ok, so I don't know how this works but I figured out how the PO had this wired and it works.  However, it is not the way the schematic says it should be wired.  In the picture the black #3 wire is also connected to a "jumper" wire that is red. You can see this in the first picture.  That "jumper" wire I connected to the post on the start switch that is above the red/black #29 wire.  This post is where the brown #29p should be.  The green #4 wire is on the post above the #3 black wire.  Some how this works. 

I have to admit the wiring schematics are hard to read for me.  I need to find a online tutorial that can help me understand the symbols and direction of current. 

I think it will be easiest to understand if we have a system to number the pin positions. For example: The Master Switch top to bottom.. Left side L1, L2 etc...right side R1, R2 etc..does that make sense to you looking at everything actually?

[daddysgirl]

If it works, leave it alone for now. As you move along with renovations you might need to understand how he did something and you won't if you switch the wires.
Once it's back together, check that breaker again...and keep an eye on the batteries charge. Record each bank separately for a few days.

EDIT: Somewhere in chapter 7 there is a list of all the symbols and number sequences. I'll help explain it if you ever need me to, but I'll have you call me. 

[Jim Blackwood]

For now, don't reinvent the wheel and go running new wires. That will complicate things further when you are trying to simplify and get back to standard wiring.

Overall I don't think your wiring looks bad. There's just a lot of it which makes it intimidating. I'll go out in a few and track down those brown and red wires for you, it's been a hard day and I need to rest a bit first.

You have 3 wires in a black sheath, green, red and black. Almost looks like an extension cord. Almost I said. Anyway that appears to be new and different and the question you should be asking is, "Why?" Why would someone want that in the start circuit? You can bet there was a reason. So start by trying to see where that wire goes. Is it unique in appearance? Does that black jacket have any markings or is it otherwise distinguishable from all the other wire bundles in your bus? Find out where it goes and you will be much closer to knowing why it is there. Then you can determine if it is working as it was intended to, if it is something you want to keep, and how it should be connected to the switch.

Jim

[Jim Blackwood]

OK JC, the brown wire is: 29P BR and it goes to pin 23 in the big brown connector.

The red wire is: 29 RDBK and goes to pin 11 in the same big brown connector.

The wires are very clearly marked so I would have to think that they could be found somewhere in that side panel.

Jim

[Jcparmley]

Thank you so much Jim.  You all have been great.  I will look for those wires tomorrow.  I'm just glad I got it started and the ECM is't fried.

I have another question that perhaps you all can answer.  Why would my cruise control on the bus only set to 58 MPH?  I was going 65 or 70 MPH but the cruise wouldn't set that high.  Do you think the computer is set for 58 mph max?  Is there a way to change that?

OK JC, the brown wire is: 29P BR and it goes to pin 23 in the big brown connector.

The red wire is: 29 RDBK and goes to pin 11 in the same big brown connector.

The wires are very clearly marked so I would have to think that they could be found somewhere in that side panel.

Jim