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All Lights Dimming While Driving Constant Speed

carl425

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carl425 Enthusiast

carl425

Posted
Posted

I'm writing this for a neighbor across the street who is older and not tech savvy (read: doesn't even own a computer)...

 

He's got an '05 1500, LT, Z-71 4-dr. The headlights and ALL interior lights started dimming on him while he's driving down the road. He says it's more like a surge dimming, meaning they only dim for a second. He said he doesn't notice when coming to a stop or slowing almost always while driving down the road around 70mph. The battery is good and the alternator is doing its job. One garage in town told him to mess with the interior light dimmer and it went away for a while... Thinking about it, that switch housing/module is the only thing common to all the lights so it's possible it is the culprit but kinda hard to troubleshoot without swapping the part. I can get a new one to the door for $53.20 from GM Parts Direct but don't want to throw parts at it and waste his money either.

 

I've searched the forum on the issue and the only thing I see are issues with dimming when coming to a stop on the '07 and newer trucks (which appears to be normal). Any help is appreciated.

Wires Enthusiast

Wires

Posted
Posted
I'm writing this for a neighbor across the street who is older and not tech savvy (read: doesn't even own a computer)...

 

He's got an '05 1500, LT, Z-71 4-dr. The headlights and ALL interior lights started dimming on him while he's driving down the road. He says it's more like a surge dimming, meaning they only dim for a second. He said he doesn't notice when coming to a stop or slowing almost always while driving down the road around 70mph. The battery is good and the alternator is doing its job. One garage in town told him to mess with the interior light dimmer and it went away for a while... Thinking about it, that switch housing/module is the only thing common to all the lights so it's possible it is the culprit but kinda hard to troubleshoot without swapping the part. I can get a new one to the door for $53.20 from GM Parts Direct but don't want to throw parts at it and waste his money either.

 

I've searched the forum on the issue and the only thing I see are issues with dimming when coming to a stop on the '07 and newer trucks (which appears to be normal). Any help is appreciated.

 

Bad battery ground?

jblakeney Senior Enthusiast

jblakeney

Posted
Posted

I love electrical gremlins.......

 

Sounds like a ground some where.... Could be the switch or module (if it has a module to control the lighting).

 

Jbo

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