Right turn signal not working?

BlueCollarTahoe · Mar 18, 2026

So I changed the bulbs in the rear and the front to led. The right turn signal will stay solid, but the lights work. The hazard lights will work if I put them on but turn off the car. All the bulbs are intact and working. Is there a dead fuse somewhere I can check?

BlueCollarTahoe · Mar 18, 2026

OR VietVet · Mar 19, 2026

I wish I could give you the answer but the only thing I can say is that, over and over and over again, I see posts like this because of changing to LED and then problems. I read somewhere that the reflective coating, on the inside of the housing, is not the same for OE and LED. That has nothing to do with your problem but even when you just put bulbs in and not the correct reflective housing, you do not get the full effect.

BlueCollarTahoe · Mar 19, 2026

The steady turn signal light was on before I changed the bulbs and intermittently on now. I’m thinking maybe a relay somewhere?

OR VietVet · Mar 19, 2026

BlueCollarTahoe said:
The steady turn signal light was on before I changed the bulbs and intermittently on now. I’m thinking maybe a relay somewhere?

Why did you not say this info in the beginning? Would not change my opinion of the LED's but when posting about a problem, it is IMPORTANT to share all of the info.

Joseph Garcia · Mar 19, 2026

Does your year truck have a separate flasher module/relay? My 07 does not, as that function was incorporated into the BCM. @OR VietVet ?

BlueCollarTahoe · Mar 19, 2026

BlueCollarTahoe said:
My bad I should’ve said that. I assume there’s some sort of relay somewhere for this?

OR VietVet · Mar 19, 2026

@Joseph Garcia, I agree that there is likely no separate flasher unit and is likely in the BCM. Gonna be some you tube videos about this or someone will know for sure. Could be related to the board at the right rear frame area or even tied in to a trailer hook up problem.

More Information for STANDARD MOTOR PRODUCTS CBT107

Fless · Mar 19, 2026

What year, make, model, and engine? Consider adding that to your signature so it's always there.

Of course there's a turn signal flasher on most, if not all, GMT800s. Once we know what you're working on we can opine.

Wiring diagrams at www.charm.li. I would suggest reinstalling good incandescent bulbs, diagnosing and repairing the issue, then trying the LEDs.

I didn't watch all of this video but he shows you "where it's at." Ignore that bad grammar, please.

LsHart · Mar 19, 2026

I know that if u change to LED lights, the flasher must be changed for LED use. If applicable. And that being said, I had a similar issue on another truck and the LED light only went in one way. But that was my issue at the time.

ScottyBoy · Mar 20, 2026

I would FIRST try installed some new bulbs to rule out the LEDs. If everything starts working fine with the new bulbs, then that tells you that your issue is caused by the LEDs.

Joseph Garcia · Mar 20, 2026

LsHart said:
I know that if u change to LED lights, the flasher must be changed for LED use. If applicable. And that being said, I had a similar issue on another truck and the LED light only went in one way. But that was my issue at the time.

LED lights only go in one way, if you want them to work.

BlueCollarTahoe · Mar 20, 2026

2004 Tahoe LT 5.3 engine.

BlueCollarTahoe · Mar 26, 2026

Wow I forgot about that giant flasher relay I changed that years ago with the same
Flasher the guy used in that video. I was thinking like one of those small 25amp ones a lot of mine are original still. ImmaFlip the lightbulb later today and keep yall posted.

OR VietVet · Mar 26, 2026

C'mon man....ImmaFlip???? Here is your school teacher right now....

Fless · Mar 26, 2026

One thing I neglected to mention was to check inside the 7-pin trailer connector. Flip up the cover and make sure there's no dirt or other detritus in there.

LsHart · May 4, 2026

Bulb flip song?

Right turn signal not working?

BlueCollarTahoe

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GMT800 2005 Tahoe Z71

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