AC wire question

[daddysgirl]

Hey all.
I have a question for those with electrical set ups similar to mine.
I've got 3 # 51 wires coming off the drivers blower housing, and one # 51 wire from the box (relay fed I believe).
On the list, there is no wire code 51...anywhere. It's shown on the schematics, but dad was using the old reverse solenoid switch to reduce the wiring on the defrost.
But even on the schematic, all four go to the same switch. I assume to power the blowers and get power from the feeder?
Also, I've got 2 #68A wires, and they are only listed in the AC Box (But I know where they go)
Anyone seen this?

[gumpy]

You'll note in your schematic that none of those wires are attached to any stud in the front junction box. They connect through a fuse on the front bussbar to a relay, then from the relay to the switch, and from the switch to a terminal block (probably in the dash), and then to the motors. That's why you can't find a wire code 51 in the junction box connections list.

[B_K]

Good explanation Craig.

I was thinking it may have had something to do with AREA 51, but didn't say anything because she's not the one broke down in Roswell, NM!
  BK 

[daddysgirl]

Yep...that explains it. The wires are routed exactly that way, the terminal block is on the side of the motor housing...so it makes sense. Thanks!

Oh, another question... I am VERY familiar with the books and with this bus, so this might be a dumb question. BUT...
Every schematic, as you all know, has a symbol for "Engine Terminal Block Stud" and ..."Cradle Harness Plug".
I am aware of several posts on the engine frame, and the studs where the harnesses enter the rear junction box.  BUT...
How can I tell the difference between them?...AND what is a cradle harness plug? I've repaired four harnesses now (perfectly, I'm proud to say) but I can't figure out what a harness plug is, where they are or how I can tell A from B from C.
I apologize for the ignorant question. I am more mechanically inclined than these questions would suggest. But I am forever grateful for the help

[bevans6]

On the side of the rear engine bay box are two plugs with screw on covers that connect the transmission wiring and the engine cradle wiring to the junction box.  The engine cradle plug is larger and has around 6 wires, the transmission plug is smaller and has 3 - 4 wires.   The engine cradle terminal strip is mounted just in-board of the slide rail just along from the big engine mount, drivers side, it has around 8 pairs of screw terminals.

Brian

[gumpy]

Yep...that explains it. The wires are routed exactly that way, the terminal block is on the side of the motor housing...so it makes sense. Thanks!

Oh, another question... I am VERY familiar with the books and with this bus, so this might be a dumb question. BUT...
Every schematic, as you all know, has a symbol for "Engine Terminal Block Stud" and ..."Cradle Harness Plug".
I am aware of several posts on the engine frame, and the studs where the harnesses enter the rear junction box.  BUT...
How can I tell the difference between them?...AND what is a cradle harness plug? I've repaired four harnesses now (perfectly, I'm proud to say) but I can't figure out what a harness plug is, where they are or how I can tell A from B from C.
I apologize for the ignorant question. I am more mechanically inclined than these questions would suggest. But I am forever grateful for the help

Honestly, if you're following all this, you're way more mechanically inclined than most women I've met! Well done. I'm guessing, based on your handle, that your daddy done well raising you. Congratulate him for me.

I was writing a response to your questions, but as I was typing Brian answered it, and honestly, I think he gave a better description than what I had written, so I'll leave it there.

[daddysgirl]

Thanks guys!
Dad and I built this bus (our third, he was a bluegrass musician) in 2001. It needed to be updated, and he always told me there was nothing about a vehicle that I, as a girl, was unable to understand. He had me scrubbing transmissions with a toothbrush when I was three, because my mom always kicked me out of the kitchen. I don't cook...go figure.

This bus was originally a manual transmission. Dad took it to Fredricksburg to have the engine/transmission (8V71/HT740) installed because he was lazy by that point. The mechanic changed some of the wiring, and I am now having to figure out what he did.

I took every wire out of the rear box, cleaned it up and realized the Neutral and Starter relays were not wired like they should have been.
He had the neutral safety switch connected to stud 12, and then to the starter solenoid, He had cut "71s" off the starter relay, along with "29s" from the neutral relay...for example.

But this is why us busnuts drive ourselves "nuts". If I can't figure it out, I'll have it towed. My pride (and knowing what my dad would say if he were still here) just requires me to try. I sincerely appreciate all the help, and I enjoy reading the other posts