I'm working on a 72 for a club member and this thing is putting me through hell. If I check the power coming off the from the main block for the signals it is weak. I have a new engine wire harness, rear taillight harness and dash harness. Am I missing a ground somewhere. Left side signal is good no right side signal or brake light. The previous owner had cut up wires and toasted the circuit board, fried the amp gauge, cut the rear wires and spliced in trailer wires, cut up the dash harness.
Electrical wirehell
daveseitz
1 - 9 of 9 Posts
I'm working on a 72 for a club member and this thing is putting me through hell. If I check the power coming off the from the main block for the signals it is weak. I have a new engine wire harness, rear taillight harness and dash harness. Am I missing a ground somewhere. Left side signal is good no right side signal or brake light. The previous owner had cut up wires and toasted the circuit board, fried the amp gauge, cut the rear wires and spliced in trailer wires, cut up the dash harness.
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585 Posts
New engine harness, new dash harness, and new rear harness? Sounds like either a ground missing or that circuit board is causing problems? Can you get a new circuit board?
Steve
Steve
I have a new circuit board in and new amp gauge in.
Wiring up date: Fri,-Mon.
%$*%(^*&^%)*&%)*&%(^&%#%^&(&*)^#$&%*^&%*%$^%&&*%(^$^&)_)(*%@#$%& SILVER MULLET!
I have the dash lights working
Interior lights working
Heater fan working
Front signals working
Left rear signals and all lights
Right side running light
SO WHAT THE HELL IS GOING ON WITH THE RIGHT SIDE?
I have swapped steering colums, reconnected the grounds, rechecked the lamps, 2 new flashers, gone back over the connections with dielectric grease, and had the dash in and out 3 freakin times! I cannot get the right rear signal or flasher to work. I get a weak signal at best, and it seems like a ground that I'm missing somewhere. Anyone have a clue what I'm missing or overlooked? Mike wants this car back at least once to drive this year and I'm loosing patience fast and could use any help I can get.
Wiring up date: Fri,-Mon.
%$*%(^*&^%)*&%)*&%(^&%#%^&(&*)^#$&%*^&%*%$^%&&*%(^$^&)_)(*%@#$%& SILVER MULLET!
I have the dash lights working
Interior lights working
Heater fan working
Front signals working
Left rear signals and all lights
Right side running light
SO WHAT THE HELL IS GOING ON WITH THE RIGHT SIDE?
I have swapped steering colums, reconnected the grounds, rechecked the lamps, 2 new flashers, gone back over the connections with dielectric grease, and had the dash in and out 3 freakin times! I cannot get the right rear signal or flasher to work. I get a weak signal at best, and it seems like a ground that I'm missing somewhere. Anyone have a clue what I'm missing or overlooked? Mike wants this car back at least once to drive this year and I'm loosing patience fast and could use any help I can get.
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3,604 Posts
So you have left turn signals front and rear...
And both brake lights?
What about 4-way flashers?
What about front right turn signal?
If you have both rear brake lights then you know the general light wiring to the rear and all rear grounds are fine. Same thing with 4-way flashers except that here you also should be able to verify front turn signals and turn indicator lights.
If you have left turn signals then the flasher is operational as is the wiring supplying power to the turn signal switch.
So only thing left after all of those validations is the turn signal switch.
And both brake lights?
What about 4-way flashers?
What about front right turn signal?
If you have both rear brake lights then you know the general light wiring to the rear and all rear grounds are fine. Same thing with 4-way flashers except that here you also should be able to verify front turn signals and turn indicator lights.
If you have left turn signals then the flasher is operational as is the wiring supplying power to the turn signal switch.
So only thing left after all of those validations is the turn signal switch.
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3,604 Posts
Ok, cool.
The front running lights are only slightly interesting to this problem. Since there are dual filaments in the front bulbs all that verifies is the grounding of both front turn signals.
Front turn signals on both sides is MUCH more interesting. That means your turn signal switch is working right.
The no brake on right is VERY interesting as that isolates the problem to the wiring to the right rear bulb and/or the bulb itself. If you have running light at right rear that rules out the ground there.
I think I would check that bulb. Perhaps put a test light on the wiring to trace things out. There is a connector up by the fuse block where you could check power.
Based on your earlier comment I would check out those trailer harness splices carefully as a bad connection there could cause exactly this fault.
The front running lights are only slightly interesting to this problem. Since there are dual filaments in the front bulbs all that verifies is the grounding of both front turn signals.
Front turn signals on both sides is MUCH more interesting. That means your turn signal switch is working right.
The no brake on right is VERY interesting as that isolates the problem to the wiring to the right rear bulb and/or the bulb itself. If you have running light at right rear that rules out the ground there.
I think I would check that bulb. Perhaps put a test light on the wiring to trace things out. There is a connector up by the fuse block where you could check power.
Based on your earlier comment I would check out those trailer harness splices carefully as a bad connection there could cause exactly this fault.
The rear wire harness is new as well. Prior to all 3 new harnesses and circuit board being installed, there was nothing on the right rear. So folks wonder why I'm on meds dealing with this, it makes no sense. The front flasher 4 ways work on the front as well. The rear lights are new LEDs that the builder bench tested and he knows they work. Having a member stopping over with a probe to help with this nightmare.
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3,604 Posts
Should be easy to track at this point. Just check a wiring diagram for the right color and start checking at each connector for power working your way back. First one by the fuse block. Next would be the connector for the back end of the intermediate harness. This is the one under the access panel in the side of the bed on an El Camino, but I cannot tell you exactly where to find it on a Chevelle 
And lastly would be the tail light socket.
I figure you can have this one isolated in 5-10 minutes :beers:
And lastly would be the tail light socket.
I figure you can have this one isolated in 5-10 minutes :beers:
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