One Line Diagram Questions

[Olacmot]

Is there a more complete one line diagram than the service manual offers? I noticed a few discrepancies, such as missing indicator lights, and no reference to the headlight/lamp harness (engine side of terminals 10-14). I didn’t see any details in wiring adaptations either… I can only guess that it’s somewhat obvious what those terminals go to so maybe they didn’t list it?

Also, what does the first part of the naming convention for each circuit stand for? Is there a circuit list somewhere? Example, off terminal 14 of the instrument panel wiring, you have “L5-18R” for high beam indicator. What is the L5? I understand 18 is gauge and R is color red. L would lead me to think “lights” and seems obvious, but others don’t seem so obvious, such as M or J.

I’ve seen some nice colored schematics (especially from @Challenger RTA ) so I was wondering if there is more information somewhere I can should get that might help me more in the future.

Thanks for the help; just trying to understand my car to the deepest level possible (which might be quite shallow)

 

[Challenger RTA]

In short, pun intended this is what it would look like with all the circuits on one page. When I was aboard a Destroyer. I found the wiring diagrams for all circuits. I was in heaven.

 

[Challenger RTA]

Do you mean something like this.

 

[Challenger RTA]

Now your back in Kansas.

 

[pschlosser]

regarding missing wiring and systems, I count about 9 different wiring diagrams for my 1970 E-body in the Factory Service Manual:

You may need to consult them all to get a complete set of diagrams for your car. As far as I recall, ALL of the diagrams are there. It does NOT list diagrams for assembly components, such as the AM Radio or the Voltage Regulator. Power windows, for example, are an option and found in a different diagram than the main body wiring one.

Color coded diagrams are nice, but as you've already spotted, the circuit number helps you follow the circuit through the diagram. The format seems to be:

XNN-GGCC, where:

X is a letter, often the first letter of the group a circuit belongs to. L=lighting, W=window, H-horn, etc.

NN is a number, usually starting with 1. Each "circuit run" gets it's own number.

GG is, as you've noted, the gauge of the wire, and

CC is the wire color.

The color of the wire in a circuit can change (or reused in another circuit), so it makes sense the circuit number is listed first. This makes it easier when flipping pages between diagrams. For example, when troubleshooting a back-up light issue, I may follow the B2 wiring from the body diagram to the instrument one.

When I need to follow a specific circuit, and use the diagram in the shop as I troubleshoot, I prefer printing the pages I need in black and white, then using a highlighter to color the circuit in question. I find this much easier to follow than a full-color diagram.

Sitting at my computer, looking at the diagram on-screen, I must admit, the prefer the color diagram.

 

[Challenger RTA]

Ok. So you want to go deep. Always think shallow

 

[Challenger RTA]

Auto wiring beginners guide. can be found here too. Collision guide & Service manual & Collision parts & Frame & Front end Alignment Inner fender & Radiator support

 

[Olacmot]

So this info was very helpful with a few issues, but I am having trouble identifying some burned connectors in the engine compartment. This is for a ‘71 Challenger originally equipped with a 318, two barrel carb, and 904 transmission.

There is a harness on the drivers side of the engine that is bundled together with wires off terminals 7 and 8 (black w/ tracer and black wire). I know these two wires are for the back up lamp switch. This harness also looks to lead down to the neutral safety switch. The wires I can’t figure out are brown and black, and are taped together with three connectors at the end of one breakout (two browns to a single connector, a single black to a connector, a single brown to a connector) and two connectors at the end of the longer breakout. There is also one single brown wire breakout coming about 6” out of the bundled/taped wires. I tried to lay the whole harness out on paper in one picture to make it a bit clearer.

The brown wire with the yellow tracer from the starter relay ground also gets bundled into this harness, I assume it goes to the neutral safety switch but I didn’t trace it… it doesn’t land on terminal 3 on the bulkhead connector as some diagrams show. Not that this wire concerns me.

Anyway, can anyone point out what these connectors went to, and what type of plastic connectors I need to cover their terminals? I am having a hard time finding it on any diagram

Thanks!

 

[Challenger RTA]

A little bit more involve. But you can see you are looking for.

 

[Challenger RTA]

On my truck that plug was bad. I think I got one from Rock Auto.
Yep.I do think it is the same. Check to be sure.

 

[Olacmot]

On my truck that plug was bad. I think I got one from Rock Auto.
Yep.I do think it is the same. Check to be sure.
View attachment 131398

So I see where it goes to the neutral safety switch on the transmission, and it’s not that plug. That plug’s breakout off this harness goes down below the car, these connectors in question look to be up at the engine. They’re just wrapped together with the neutral safety switch wires. Does that make sense? If the neutral safety switch is not what you’re suggesting, give me a hint. I am bummed I haven’t figured this out

Funny enough, I have a spare one of these plugs. My kick down linkage knocks it off every once in a while and my headers burnt it up once. Fun parking lot repair to get home!

Also, what is BJ and RW only? Were those options/packages?

 

[pschlosser]

Also, what is BJ and RW only? Were those options/packages?

It took me some time to figure out where @Olacmot was seeing BJ and RW, and I think I figured it out. They are indicated in the 1973 wiring diagram shown by post #9.

BJ and RW refer to models of cars. The Dealer Parts Book makes these letters really clear. Once we learn them, they become second nature. BJ are E-bodies, and RW are B-bodies.

B = Barracuda/Cuda
J = Challenger
R = Belvedere/Satellite
W = Coronet/Charger

 

[Olacmot]

It took me some time to figure out where @Olacmot was seeing BJ and RW, and I think I figured it out. They are indicated in the 1973 wiring diagram shown by post #9.

BJ and RW refer to models of cars. The Dealer Parts Book makes these letters really clear. Once we learn them, they become second nature. BJ are E-bodies, and RW are B-bodies.

B = Barracuda/Cuda
J = Challenger
R = Belvedere/Satellite
W = Coronet/Charger

Correct. Here is an example off Challenger RTA’s schematic where BJ and RW are referenced. Thanks! I was thinking it was differences between options packages on an e body. Not a different platform… which makes sense.