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Username Post: 72 C10 turn signals        (Topic#341751)
"8th" Year" Silver Supporting member
Posts: 32
Reg: 09-15-15
01-07-17 12:27 PM - Post#2669852    

This is an odd one. All of the lights on my pickup work swimmingly. Headlamps, taillights, flashers, turn signals, etc. all work as required--with one exception. When the headlights or parking lights are on, the front turn signals don't blink--they are just on. Have already replaced the headlight switch--no joy. Any ideas out there?


Frequent Contributor
Posts: 1463

Age: 41
Loc: Redding Ca
Reg: 10-02-14
01-07-17 06:14 PM - Post#2669943    
    In response to faverde

My opinion is it is probably a loose or broken ground.

71 Chevelle BBC powered
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2010 GMC Sierra crew cab 4X4 r...

Chevytalk Moderator & "16th Year" Silver Supporting Member
Posts: 5124
Loc: Muskegon, MI, USA
Reg: 03-28-02
01-08-17 10:55 AM - Post#2670087    
    In response to faverde

As mentioned it is probably a grounding problem.

Make sure that the headlight ground wires are intact and making good contact with the radiator support. Also, make sure the radiator support is well grounded.

I have run into a lot of grounding problems in the socket to housing crimp on the 71-72 trucks.

A quick test is to run a good ground wire to a cleaned area on the outside of the socket while the flasher is on with the headlights. If grounding the socket makes the turnsignal flash then a quick fix that seems to last is to remove the light housing and bulb. Using a dull chisel with the socket resting on your vise jaws, go around the crimp area with your chisel at 90 degrees and lightly hit the chisel to indent the area in several places which tightens the crimping.


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"8th" Year" Silver Supporting member
Posts: 32
Reg: 09-15-15
10-05-22 11:31 AM - Post#2848141    
    In response to JimKshortstep4x4

To all who offered advice on this one, thanks. I finally gave up and had my favorite shop trouble shoot the problem. They found that the aftermarket turn signal (park light assembly) holders had been wired in reverse at the factory.


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