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Having blinker troubles, Any electrical people in here?

384 Views 9 Replies 4 Participants Last post by  coainpaso
Hi all. I'm having some trouble with my blinker, which is preventing me from getting the required state inspection sticker. For some reason, my driver's side blinker will only work if the headlights are off. If I turn them on, that side won't blink. 87 Silverado.

When the headlights are on, I'm also getting the "check your blinker" signal. This means that the green blinker indicator in the cab stays lit up at all times. Instead of just flashing when the blinker is turned on. The truck sat in the garage for 4 months, but before that everything worked fine. Anyone ever had this problem, or have any idea what's causing it?

Here's a little more detail: I replaced the ground wire, and that actually fixed it temporarily. Now the problem is back. The plug was old and crusty looking, so I replaced that too. No effect. I've used LED's all throughout the truck for years. Always worked fine. But it's worth noting that when I place an incandescent bulb in the socket, this problem disappears. Still, I need to fix it so that it doesn't eventually stop working even with an incan bulb.

Any help would be greatly appreciated
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Have you tried swapping out that LED for another one? It may have worked before, but since they’re so low resistance bulbs, any variance can make them act up. That’s why your incandescent bulb “fixes” your issue. Agree with what the other poster said, go back and double check every ground and socket, and try adding resistors if nothing works.
 

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Have you tried swapping out that LED for another one? It may have worked before, but since they’re so low resistance bulbs, any variance can make them act up. That’s why your incandescent bulb “fixes” your issue. Agree with what the other poster said, go back and double check every ground and socket, and try adding resistors if nothing works.
Yeah I put the passenger side LED in there, which works fine on the passenger side. But in the driver's side, it still gives me the same problem. So I think we can rule out the bulb itself.

I even added a new ground, which partially fixed the problem. Before I made a new ground coming from the plug, the blinker would never work. It just had the "problem" light on all the time. Which means the blinker indicator stayed lit up all so you'd know there was an issue. After I added the new ground, the blinkers work fine as long as the headlights are off.

I like the resistor idea. I've never worked with them before though, any idea which resistor I'd need to use?
 

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where it works without the head lights on tells me the head light may be using that circuit as a ground , I'm guessing the blinker worked properly at some point so adding a resistor may not cure the problem..Does the head light work if you remove the blinker bulb?
 

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My 85 does this, and I know it’s because one the contacts in the bottom of the socket isn’t making good contact, seems like it’s been smashed down and can’t touch the bulb anymore.

Yikes, just saw this was 3 months old… wonder if he fixed it.
 
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