Mopar Electrical Specialist needed

[1carlover]

Is there anyone in the Philly area that can help me diagnose an electrical short in my 67 Coronet rt ?
I have many posts on FBBO regarding the issue i've been having but a wire in my new dash harness has finally smoked indicating where to look. It's been a years long search for the problem and I now i can't drive the car. See attached photos of the wire damage any help is greatly appreciated.

 

[davek]

You should be able to post photo on main page. Is your car over charging? Can you tell us were and what color wire smoked?What it was attached to?

 

[sam dupont]

Post links to your previous posts to get up to speed.

To post photos:
When you post a reply, there is a ADD PHOTOS box at the lower left

 

[davek]

67 Instrument light circuit

Help!! I'm still trying to isolate the cause of the dash light fuse blowing in my 67 r/t but can't find the source of the problem. More than likely its a grounding issue from an undetermined source and the dash lights are the only thing affected. The headlight switch and wiring or circuit board...

www.forbbodiesonly.com

 

[1carlover]

You should be able to post photo on main page. Is your car over charging? Can you tell us were and what color wire smoked?What it was attached to?

It's the purple wire on the repro harness but it's a brown wire in the service manual that goes from the 10 wire plug near the steering column going and the fried purple disappearing into the steering column.

 

[davek]

whats does it feed in the column? You should be able to go from there. I know on a 67-70 there is a ground strap fron column to frame. Does the 67 have one?

 

[440 4 speed]

whats does it feed in the column? You should be able to go from there. I know on a 67-70 there is a ground strap fron column to frame. Does the 67 have one? View attachment 1672663View attachment 1672662

Yes

 

[1carlover]

whats does it feed in the column? You should be able to go from there. I know on a 67-70 there is a ground strap fron column to frame. Does the 67 have one? View attachment 1672663View attachment 1672662

I don't have a ground strap like that but I'm going to check my original 67 harness to see if it has a ground strap like this one. The brown wire going into the steering column is the one that fried not the new harness.


that on

 

[davek]

your car needs that ground strap its factory,you could make one. What is the brown wire feeding?

 

[1carlover]

Thank you for you help with this problem. I just inspected the harness again and the burnt purple wire on the turn signal harness plug is connected to the red wire on the dash harness. My dash harness is grounded correctly with the brown wire as shown in the photo you sent. I need to find a diagram of the steering column harness because there is a brown wire there that isn't connected to anything and could be another ground.

 

[davek]

MyMopar

mymopar.com

 

[Wietse]

Just looking in the wiring diagram of my '69 Coronet, but the brown wire (Pin #8) as per this is for the rear lights turn signal.
Could have a short in the rear light units on the turn signal bulb(s)

 

[451Mopar]

From the Wiring – MyMopar info, the violet wire is for the backup lights.
The black connector going under the dash looks correct for wire colors and locations, but all the steering column wires don't seem to match up to the wiring diagram.
Is the car an auto or manual transmission? If auto, column shift or console shifter? there are a few differences with the different options.
None of the turn signal wires in the column look correct? Likely will need to remove steering wheel and maybe replace the turn signal wiring with the correct one for the car.

 

[Wietse]

the steering column wires don't seem to match up to the wiring diagram.

I think the wiring diagram only shows the main harness and those colors, so after the plug could be different and are not indicated at the diagram. At least that was the thought i got, strange they change the colors after a connector.
Unless either one is "not as original"?

 

[69_A12_6BBL]

Is there anyone in the Philly area that can help me diagnose an electrical short in my 67 Coronet rt ?
I have many posts on FBBO regarding the issue i've been having but a wire in my new dash harness has finally smoked indicating where to look. It's been a years long search for the problem and I now i can't drive the car. See attached photos of the wire damage any help is greatly appreciated.

View attachment 1672620

View attachment 1672621

View attachment 1672622

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View attachment 1672624

View attachment 1672625

View attachment 1672626

Honestly, (if one had the money?) Most of us would Gut the Dash & engine wiring, replace with New M&H harnesses. Not everyone wants to go that route. Looks as if a Reverse light bulb shorted or something Pinched it grounded at one time.

 

[ynst]

Is there anyone in the Philly area that can help me diagnose an electrical short in my 67 Coronet rt ?
I have many posts on FBBO regarding the issue i've been having but a wire in my new dash harness has finally smoked indicating where to look. It's been a years long search for the problem and I now i can't drive the car. See attached photos of the wire damage any help is greatly appreciated.

View attachment 1672620

View attachment 1672621

View attachment 1672622

View attachment 1672623

View attachment 1672624

View attachment 1672625

View attachment 1672626

Pinched or chaffed wire shorted to ground.

Who put the column together and stabbed the wire with a screw?

 

[1carlover]

Pinched or chaffed wire shorted to ground.

Who put the column together and stabbed the wire with a screw?

Pinched or chaffed wire shorted to ground.

Who put the column together and stabbed the wire with a screw?

Pinched or chaffed wire shorted to ground.

Who put the column together and stabbed the wire with a screw?

Fortunately that didn't happen but i believe the signal switch was at fault and has been replaced.

 

[1carlover]

From the Wiring – MyMopar info, the violet wire is for the backup lights.
The black connector going under the dash looks correct for wire colors and locations, but all the steering column wires don't seem to match up to the wiring diagram.
Is the car an auto or manual transmission? If auto, column shift or console shifter? there are a few differences with the different options.
None of the turn signal wires in the column look correct? Likely will need to remove steering wheel and maybe replace the turn signal wiring with the correct one for the car.

Sorry for late reply but I had the stock 67 steering column sent out for a tilt conversion some years ago using a gm tilt mechanism and switch. That explains the the different colored wires.

 

[ynst]

The purple wire in a GM turn signal switch is the output of the turn signal flasher going into the turn signal switch. The wire feeding the turn signal flasher should be protected by a fuse and, if it was, the fuse will blow before the wire even comes close to melting.

One of your pictures seems to show the burned portion of the wire stopping right where the harness wraps around the sharp edge of the dash frame. The dash brace chaffed through the insulation and the wire burned back from that point towards the flasher, itself.

My thoughts are that the circuit was unprotected and the wire got chaffed right at the above-mentioned bend. You should have blown a fuse LONG before the wires burned.

Properly wired, there is absolutely no reason why ANY of the wires in the signal switch should melt like that. The white wire is the output of the brake switch which should be fused. The brown wire is the output of the hazard flasher which should, also be fused. The purple wire,as previously mentioned should be fused as well. The rest of the wires are, merely, switch-selected outputs of these three fused inputs.
The only other wire is the black horn button wire which is grounded when the horn ring is pressed and it grounds the horn relay to operate the horn.

I doubt that the problem was the switch but, now that it's melted, replacing it will, obviously fix your symptom but I think you still have a problem.

Check all three circuits and make sure they're properly fused.

 

[451Mopar]

Sorry for late reply but I had the stock 67 steering column sent out for a tilt conversion some years ago using a gm tilt mechanism and switch. That explains the the different colored wires.

I thought it might be a GM switch, but couldn't figure how it was mounted? Thinking it was a stock steering column.
I would have to look up the GM switch colors, but besides the signal switch, the shift lever (column or floor) should have a reverse light switch and lamp.
If those work, then need to see which of the turn signal wires goto which connector cavity to match up to the stock wiring, and that is after checking for shorts to the turn signal switch (maybe a wire git pinched in the column?)