Tail lights flickering over bumps. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RotaryRocketeer · 04-20-2018, 11:00 AM

So, either my tail lights or brake lights are flickering when I go over bumps in the road. Seeing how my truck is a one ton, everything in the road is a bump. These are not factory brake/tails. They're the units from SuperBrightLED for flatbeds/trailers.

I didn't know anything about it until my buddy mentioned it while following me the other day. Who knows how long it's been going on but, now that I know, it's annoying the hell out of me. All other electrical systems operating normally. Any tips on where to look first? All help and suggestions appreciated.

**mongocanfly** · 04-20-2018, 01:17 PM

look for a loose/bad ground.....other than that it would be the power side...im using the same lights [probably] and they are sealed so theres not much to check internally

**Getter-Done** · 04-20-2018, 01:34 PM

You could try a temporary (or maybe permanent) ground strap to a good ground spot.

Dead Parrot · 04-20-2018, 02:07 PM

Adjust the brake light switch at the pedal. Could set so that any pedal movement caused by a bump flickers the lights.

Could have been doing it for a long time. When you switched to the instant on LEDs, it became more noticeable.

RotaryRocketeer · 04-20-2018, 02:49 PM

Quote:

Originally Posted by Dead Parrot

Adjust the brake light switch at the pedal. Could set so that any pedal movement caused by a bump flickers the lights.

Could have been doing it for a long time. When you switched to the instant on LEDs, it became more noticeable.

Forgot to mention, I figured that the brake light switch was the culprit as well. Drove right to the closest parts store and replaced. While the factory one was sloppy, it was not the cause. I adjusted properly with a second set of eyes to check engagement point.

RotaryRocketeer · 04-20-2018, 02:51 PM

Found the problem while I was fiddling with it over my lunch break. Poor wiring by PO at the 7-pin. Sealed up a couple frayed ends and stragglers and all is well. Will strip it all out and rewire soon. I was driving and noticed that the trailer brake controller light was flashing over bumps as well, so logic pointed to that circuit.

Thanks to all for the input!

04-20-2018, 11:00 AM	#1
RotaryRocketeer Registered User Join Date: Jul 2017 Location: OKC, OK Posts: 247	Tail lights flickering over bumps. So, either my tail lights or brake lights are flickering when I go over bumps in the road. Seeing how my truck is a one ton, everything in the road is a bump. These are not factory brake/tails. They're the units from SuperBrightLED for flatbeds/trailers. I didn't know anything about it until my buddy mentioned it while following me the other day. Who knows how long it's been going on but, now that I know, it's annoying the hell out of me. All other electrical systems operating normally. Any tips on where to look first? All help and suggestions appreciated.

04-20-2018, 01:17 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,674	Re: Tail lights flickering over bumps. look for a loose/bad ground.....other than that it would be the power side...im using the same lights [probably] and they are sealed so theres not much to check internally __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

04-20-2018, 01:34 PM	#3
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 8,454	Re: Tail lights flickering over bumps. You could try a temporary (or maybe permanent) ground strap to a good ground spot.

04-20-2018, 02:07 PM	#4
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,628	Re: Tail lights flickering over bumps. Adjust the brake light switch at the pedal. Could set so that any pedal movement caused by a bump flickers the lights. Could have been doing it for a long time. When you switched to the instant on LEDs, it became more noticeable.

04-20-2018, 02:51 PM	#6
RotaryRocketeer Registered User Join Date: Jul 2017 Location: OKC, OK Posts: 247	Re: Tail lights flickering over bumps. Found the problem while I was fiddling with it over my lunch break. Poor wiring by PO at the 7-pin. Sealed up a couple frayed ends and stragglers and all is well. Will strip it all out and rewire soon. I was driving and noticed that the trailer brake controller light was flashing over bumps as well, so logic pointed to that circuit. Thanks to all for the input!



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