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Username Post: Turn Signal Gremlin        (Topic#362763)
57210sportsedan 
Member
Posts: 46

Loc: Germany / Georgia (US)
Reg: 02-06-03
10-01-20 04:00 AM - Post#2804583    

Hi all,
I replaced all the wiring (American Autowire) on my 57 210 Sport Sedan and everything worked fine. But after months of sitting and tinkering (the car is still under restoration), my turn signal lights don't work and here is where it gets weird.

The left side works fine but the right side doesn't. I isolated the turn signal switch and get continuity as I should (yellow to pink and light blue or yellow to purple and dark blue depending on how the switch is switched) but as soon as I put the juice on the yellow wire, nada on the right side.

To be sure it wasn't the signal switch after all, I disconnected it and plugged in an original NOS one I had. No change – the switch behaves normally disconnected from everything but as soon as the yellow wire has 12v, no juice to the right when switched (although the flasher still clicks).

I suspected a short in the grill bar wiring harness (those bulb plugs are kinda crappy) but again, I am not even getting juice to the dark blue wire at the switch, let alone firewall or grill bar.

Another thing, suddenly the fuel gauge seems to be getting no signal from the sender (goes past full) but the tank was run bone dry on the weekend and may just be the travel on the float-arm needing a tweak. The body harness is also new and I don't think it is pinched anywhere. I will do a thorough continuity test on it tonight and also check the taillight housings/plugs for shorts.

And the 9 Amp fuse (top right on fuse panel) keeps blowing. But not every time I use the turn signals or any other sensible pattern. Just every now and then.

Any ideas? I am really scratching my head on this one! Could it be related to the voltage regulator? I found a stray bolt bridging the bottom two polls when the generator suddenly stopped generating a week ago. The only other potentially relevant detail I can think of is a hazard light switch that I wired in year ago (which also worked properly until last week) but to troubleshoot this blinker problem I completely disconnected it (no change) … and with the NOS signal switch, it's now as if the flashers were never even there!

Maybe the car is just punishing me for leaving it parked outside for a decade ...

Markus
57 Chevy 210 Sport Sedan
70 Triumph Spitfire
bought and sold a few more ...


Edited by 57210sportsedan on 10-01-20 05:27 AM. Reason for edit: No reason given.

 


acardon 
Ultra Senior Member
Posts: 11431
acardon
Loc: DFW TEXAS
Reg: 03-25-05
10-01-20 06:35 AM - Post#2804592    
    In response to 57210sportsedan

Do he brake lights work?
Did you check the rear harness connector for a good connection or the terminals push back in the plug. That would explain both signals and gas gauge.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
57210sportsedan 
Member
Posts: 46

Loc: Germany / Georgia (US)
Reg: 02-06-03
10-01-20 01:26 PM - Post#2804608    
    In response to acardon

Hey Don, thanks for the response, yes I did check the plug. I also disconnected the plug to check the continuity of each wire going back (except the license light I just realized). It makes no sense at all. The bulbs are good, flasher clicking (and working all 3 bulbs on the the left side). The right side clicks but no power is coming out of the turn signal wires that should be lighting right front, right rear or the indicator in the dash. The same problem with either an aftermarket or NOS GM signal switch.

And no, somehow the brake lights are dead too! Power goes in and out of the plunger-switch but nothing arrives at the back. I have the housings installed with only one speed nut each, but that should give me at least a little ground shouldn't it?

Could it be a headlight or ignition switch? That still wouldn't explain the left working, right not situation, but hey, I am happy with a fix even if I I don't understand why at this point!

Markus
57 Chevy 210 Sport Sedan
70 Triumph Spitfire
bought and sold a few more ...


Edited by 57210sportsedan on 10-02-20 12:00 AM. Reason for edit: No reason given.

 
57210sportsedan 
Member
Posts: 46

Loc: Germany / Georgia (US)
Reg: 02-06-03
10-03-20 07:50 AM - Post#2804716    
    In response to 57210sportsedan

OK, I think I have it figured out now for anyone who is interested. American Autowire body harness (or taillight pigtails) in Gene Smith taillight housings seem to be a bad idea. The contacts on the new taillight plugs are so large (1/16" bigger than original) and the plastic part such a sloppy fit into the housings that the contacts seem to be shorting out on the sides (possibly in the grill bar too). Try figuring that out with a multi-tester that gives random continuity readings!

Markus
57 Chevy 210 Sport Sedan
70 Triumph Spitfire
bought and sold a few more ...


Edited by 57210sportsedan on 10-03-20 07:51 AM. Reason for edit: No reason given.

 
57210sportsedan 
Member
Posts: 46

Loc: Germany / Georgia (US)
Reg: 02-06-03
10-06-20 01:52 PM - Post#2804970    
    In response to 57210sportsedan

In case anyone is interested, yes the new American Autowire taillight pigtails were shorting in the tailight housings. The contacts on the plugs are so wide they hit the socket sides. I had to cut the ends off and solder the originals back onto my otherwise brand new harness. The car nearly caught fire while hunting this down. I got very lucky.

Markus
57 Chevy 210 Sport Sedan
70 Triumph Spitfire
bought and sold a few more ...


 


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