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Old 05-28-2019, 07:42 PM   #1
72 GMC C1500
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LED tail light issue

I recently bought and installed some LED tail lights and reverse lights. The brakes light up fine, but with the brakes engaged, when I put the turn signal on, that light goes out, no blinking, just out, the other one stays on. I've installed an led flasher. I checked other posts, but couldn't find any with the same issue. Any ideas? I appreciate the help!
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Old 05-28-2019, 08:06 PM   #2
dmjlambert
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Re: LED tail light issue

You could try installing load resistors and see if that helps. That is probably the approach I would take, so I could just use a regular flasher module.
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Old 05-29-2019, 01:12 AM   #3
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Re: LED tail light issue

Quote:
Originally Posted by 72 GMC C1500 View Post
I recently bought and installed some LED tail lights and reverse lights. The brakes light up fine, but with the brakes engaged, when I put the turn signal on, that light goes out, no blinking, just out, the other one stays on. I've installed an led flasher. I checked other posts, but couldn't find any with the same issue. Any ideas? I appreciate the help!
Do the turn signals work with the brakes not engaged?
The turn signal switches are designed to turn off the brake light on the side that
is selected for the turn so that the turn signal can be seen, while leaving the other brake light illuminated. If neither light is on on the right while turning right or if neither light is on while turning left, I would suspect a bad turn signal switch.
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Old 05-29-2019, 06:55 AM   #4
72 GMC C1500
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Re: LED tail light issue

Thank you both for your quick replies. VetteVet, forgive my ignorance, but is the turn signal switch the same as the flasher that plugs into the fuse box or is there something else I'm missing. This one is new, but I'll order another and give it a try. Seems like culprit. Thanks again!
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Old 05-29-2019, 07:26 AM   #5
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Re: LED tail light issue

And to answer your question, they don't blink at all, with or without the brakes on. Thanks
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Old 05-29-2019, 10:07 AM   #6
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Re: LED tail light issue

If you end up needing a new relay, try these, https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I replaced my brake lights with LEDs and had the fast blink issue. These solved it. Also, if your hazard lights are on a separate circuit, you'll need one of these for the hazard lights as well then.
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Old 05-29-2019, 12:05 PM   #7
72 GMC C1500
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Re: LED tail light issue

Thanks for the heads up. This is the same one I have. Maybe I got a faulty one.
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Old 06-03-2019, 12:15 PM   #8
72 GMC C1500
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Re: LED tail light issue

Update-I ordered a new flasher and got it installed...no change. Now here's where I feel like a complete idiot. I started the truck up this weekend and gave it a try and the blinkers work! Apparently the truck needs to be running in order for the blinkers to work. Is this typical?
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Old 06-03-2019, 02:17 PM   #9
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Re: LED tail light issue

Quote:
Originally Posted by 72 GMC C1500 View Post
Update-I ordered a new flasher and got it installed...no change. Now here's where I feel like a complete idiot. I started the truck up this weekend and gave it a try and the blinkers work! Apparently the truck needs to be running in order for the blinkers to work. Is this typical?
The truck does not necessarily need to be running, however the ignition switch has to be in the "ON" position for the turn signals to operate. (The 4-way flashers and the brake lights will work with the ignition switch off.)
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Old 06-03-2019, 03:34 PM   #10
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Re: LED tail light issue

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Originally Posted by 72 GMC C1500 View Post
Update-I ordered a new flasher and got it installed...no change. Now here's where I feel like a complete idiot. I started the truck up this weekend and gave it a try and the blinkers work! Apparently the truck needs to be running in order for the blinkers to work. Is this typical?
I recently discovered the same thing while rewiring my dash. Apparently my flasher doesn't like low voltage. Once the voltage dropped to 11.5 ish, it slowed down then just stopped. Start the engine and she worked fine. I even had the battery tested and it passed the test. So, I just put my battery charger on it when I'm working on it for long periods without it running. Typical? I don't know, but that's the way mine is.
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