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Dimming Headlights

rwick3142

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rwick3142 Enthusiast

rwick3142

Posted
Posted

I have an 02 Denali, and when I get off the gas, the headlights dim way down. I notice the amp's drop on the gauge, is there any way to keep the amp's up so that the dimming stops? Maybe a better alternator? any help appreciated, I had the same problem with my 00 Yukon XL. The truck also has either a flywheel clanking in reverse, or I was thinking the heat shield may be loose....Thanks.

bossier62guy Senior Enthusiast

bossier62guy

Posted
Posted
I have an 02 Denali, and when I get off the gas, the headlights dim way down. I notice the amp's drop on the gauge, is there any way to keep the amp's up so that the dimming stops? Maybe a better alternator? any help appreciated, I had the same problem with my 00 Yukon XL. The truck also has either a flywheel clanking in reverse, or I was thinking the heat shield may be loose....Thanks.

 

Perhaps you should take your vehicle into an automotive electrical shop and have them check out your charging system. Is the vehicle stock or do you have lots of gadgets that are putting an additional load on the system? I doubt you're hearing a flywheel clanking, if you have an automatic you have no flywheel....my guess without seeing it would be a u-joint.

Draenor Senior Enthusiast

Draenor

Posted
Posted
I have an 02 Denali, and when I get off the gas, the headlights dim way down. I notice the amp's drop on the gauge, is there any way to keep the amp's up so that the dimming stops? Maybe a better alternator? any help appreciated, I had the same problem with my 00 Yukon XL. The truck also has either a flywheel clanking in reverse, or I was thinking the heat shield may be loose....Thanks.

 

Perhaps you should take your vehicle into an automotive electrical shop and have them check out your charging system. Is the vehicle stock or do you have lots of gadgets that are putting an additional load on the system?

:)

The voltage regulator in the alternator may be bad.

Zembonez Senior Enthusiast

Zembonez

Posted
Posted
The voltage regulator in the alternator may be bad.

This is very possible.

 

Some amperage drop at idle is going to happen with the lights on. Try it with them off and see what you get.

 

GM had real issues with battery cables in the late 90s - early 00s. The ground cables corroded internally and built up resistance... eventually failing altogether. Clamp a jumper cable to the engine and to the negative terminal of the battery. If the problem goes away or gets noticeably better, the cable is probably bad. If not, then have the alternator tested.

 

I'd bet one or the other solves your problem. :)

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