Friday, October 12, 2007


I've been perplexed by the 68 Tempest/LeMans/GTO signal and flasher wiring for some time. I thought I understood the circuit; which lead me to believe that the flasher switch which is integrated into the turn signal switch in the steering column as shown below:

(Apologies for the blurry picture.) At any rate, I was able to use jumper wires below the steering column to get "flasher" behavior and this said to me that the problem had to be in the steering column turn signal switch and harness.

When I got the new repro harness and switch, I was astonished that it did not address the problem. I tried a number of different alternatives to diagnose where the problem was -- and I did notice that while I had a good fuse in the hazard lights slot, I did not notice the actual slot was dead; when it should have power. At this point, I went to the wiring diagrams to try to figure out how the wires went into the fuse block; with the idea that for now; I would bypass the fuse block and run an inline fuse to the flasher... bypassing whatever problem was actually going on in the fuse block -- saving that problem for another time -- like a winter time project.

At any rate, I went to the performance years forum to get advise. Unbelievably, it turns out there are actually two different flasher units; one for the turn signals and one for the hazard lights. One complication of the circuits is that different power sources are required for turn signals and hazards. Hazard lights are operational at all times for the car; whereas turn signals only operate when the ignition key is switched.

At any rate, the T/S switch is up near the steering column and this is the one that I've replaced and played with these past months. There is also one which is mounted to the fuse block which drives the hazard lights. When I looked at my fuse block, the flasher unit was missing! Well this is certainly at least part of the problem. I happened to have a spare flasher, plugged it in and viola! Flashers.

I believe that I'm now down to finishing the backup lights to pass inspection. I have that whole circuit wired, I just need to install the switch in the "exact" spot that causes the switch to trigger when the shifter is in reverse. That "exact" spot I've played with already, and there isn't a lot of room for error and I'm looking forward to alot of excitement getting it installed.

All in all it has taken me way, way longer to get the car into this shape; and while I think I am disappointed it has taken so long; I sure have gotten a variety of things fixed on the car through the journey.

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