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Need some electrical wiring help

SK8BALL

SK8BALL

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Installing some digi-tails in the 74 Charger.
Wiring diagram looks like this
42E1A57C-15C5-412F-B253-A06723EFC61C.jpeg
Here is what I have
6C9D143A-3CB5-427A-AF3E-09E5C46D4747.jpeg

Can anyone tell me which wires are which?
It says there is supposed to be a yellow wire but there is not.

Any help is greatly appreciated.
 
Best way to proceed is with a test light or ideally a logic probe. That way as you power up a circuit you can be sure which wire does what.
 
Here is the wiring diagram.. Not sure if its going to help. I would use a tester like mentioned.

74CoronetChargerB.png
 
Thanks for the diagram.
I’m just trying to figure out the colors.
Can’t quite read them on the diagram.
 
SK8BALL said:
Thanks for the diagram.
I’m just trying to figure out the colors.
Can’t quite read them on the diagram.
Click to expand...
You can right click on the picture and save it and open it up in paint or some other picture viewer.
But just incase you can go here and download it your self.
https://www.mymopar.com/downloads/wiringdiagrams/1974Wiring.zip

Violet = reverse lights
Green pretty sure is left turn signal
Black Running lights... Marker lights I edited this said it was ground before.
Brown is tail Right signal
Dark blue is usually a fuel sender wire.
 
Last edited:
Violet, back up
Green, one side high intensity filament bulbs... hazzard/turning/brakes
Brown, the other side... I allways forgett which color feeds which side
Black, parking/license lights
Gray, ground.

There is there a blue wire? I can't recall any blue wire on my tail lights grommet. Blue wire on rear harness is gas sender and pink batt for the trunk lid light, but these wires doesn't get the tail lights. That's all the trunk wiring, nothing more, nothing less.

No yellow wiring on rear. Just in dash harness for the door jam ground circuit ( traced black usually ) and starter relay ign system ( some parts traced black on 74 for the interlock system ). That's all the yellow wiring on our cars.
 
Last edited:
Nacho-RT74 said:
Violet, back up
Green, one side high intensity filament... hazzard/turning/brakes
Brown, the other side... I allways forgett which color feeds which side
Black, parking/license lights
Gray, ground
Click to expand...
Brown is right. Green is left. Black is tail/stop.... You are correct. I was seeing it wrong.
 
Last edited:
BeepBeepRR said:
Brown feeds both sides. Its the brake light.
Click to expand...
No, brake light is spliced into each side from the turning switch. Each side gets its own wire for brakes, hence why you still get brakes on one side with turning lights on the other side since 70 with the new hazzard button built into the turning switch. This is because brake, turning amd hazzards use same wires and filament on bulbs.

On earliers is the same, just that the divorced hazzard switch gets wired slightly diff and on them you can get brake lights with hazzards on, but on 70 and on you can't get brake lights with hazzards on.
 
Last edited:
Nacho-RT74 said:
No, brake light is spliced into each side from the turning switch. Each side gets its own wire for brakes, hence why you still get brakes on one side with turning lights on the other side since 70 with the new hazzard button built into the turning switch.

On earliers is the same, just that the divorced switch gets wired slightly diff and on them you can get brake lights with hazzards on, but on 70 and on, you can't get grake lights with hazzards on.
Click to expand...
I edited my post. I was looking at it wrong you are correct. I guess I was thinking trailer lights.. lol Colorized it.

color74CoronetChargerB.png
 
Last edited:
Nacho-RT74 said:
Violet, back up
Green, one side high intensity filament bulbs... hazzard/turning/brakes
Brown, the other side... I allways forgett which color feeds which side
Black, parking/license lights
Gray, ground.

There is there a blue wire? I can't recall any blue wire on my tail lights grommet. Blue wire on rear harness is gas sender and pink batt for the trunk lid light, but these wires doesn't get the tail lights. That's all the trunk wiring, nothing more, nothing less.

No yellow wiring on rear. Just in dash harness for the door jam ground circuit ( traced black usually ) and starter relay ign system ( some parts traced black on 74 for the interlock system ). That's all the yellow wiring on our cars.
Click to expand...
The blue wire runs in the harness from the kick panel to just after the rear seat. It drops out there to go to the fuel sender. As well as a pink wire for the trunk light.
The actual rear tail light harness I never could find a reproduction of those. When I was working on the 71 Satellite.
 
right, but doesn't reach the tail light harness grommet. it splices from the harness tape just after the rear wheel well. On the OP pic there is a blue wire on grommet... weird
 
Last edited:
Nacho-RT74 said:
right, but doesn't reach the tail light harness grommet. it splices from the harness tape just after the rear wheel well. On the OP pic there is a blue wire on grommet... weird
Click to expand...
Yea, didn't think about the blue wire in that grommet that is a wtf..
 
You guys are great!
Got the correct colors matched up and
everything is working great.
Thank you for your help.
But I have a new problem……
No brake lights.
Running lights, flasher lights, turn signals,
reverse lights all work on both sides.
Just no brake lights on either side.
Not sure if they were working before the tail light
upgrade. Just got the car out of storage and
did not check before the new tail lights.
Any ideas on the brake lights?
 
Got everything tested an figured out.
Just no brake lights.
See post 14 for details
 
Check the pink and white wires on the brake switch. Make sure they are on the connectors. That will be just above the brake peddle. That pink wire goes directly to the fuse block. Make sure your fuses are good. Check for constant power on the pink wire. Then push the brake peddle and see if you have power going out on the white one. If not replace brake switch.

This is only true with a factory harness. Not sure what colors they use for the brake light switch on an aftermarket wiring harness.
 
Last edited:
Could it be a problem with
the turn signal switch?
 
Pink wire arriving to pedal switch becomes on white between pedal switch and turning switch.

Yes, the brakes comes from turning switch being sourced from white wire and is routed to green and brown wires while turning switch is off.

Two issues to check here and one of them was my own experience. Bad contact on white wire between dash harness and turning switch plugs ( that was my experience ). The next one is a damaged turning switch that could become "easy to fix" with a canceling cam replacement. That a part of the switch what carries the contacts to route the power as is needed.

But you can begin the check looking at the pedal switch itself as mentioned, then the plug dowm the column.

Brakes source is shared with the hazzards, so if hazzards are working is not a fuse fail.
 
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