Dash Lights Dimmer

[bluebear15]

I have a 2006 Tahoe Z71 with Bose and while I'm driving I have noticed that the dash lights will all dim or brighten randomly. Same effect as when you roll the dial switch to increase or decrease how lit up they are. The dimmer wheel does not move while driving and it can happen just on a straight road with no bumps. Was looking for some input on how to fix. Thanks.

 

[bluebear15]

Anyone?

 

[MrBalll]

Is your alternator still good?
If it's a straight road I wouldn't think the adjustment wheel would be a problem. Almost sounds like it's losing power to me.

 

[swathdiver]

Does the computer on the GMT800s control the alternator output for increased fuel efficiency? If so, this may explain the flickering. Check your battery and alternator output. Anyone around you with a Tech2?

 

[TM98]

My 04 is doing the same. I’m not sure if it is the automatic headlight switch because when it gets bright I can kinda push on the switch lever and it will get darker or lighter.

 

[Rocket Man]

Does the computer on the GMT800s control the alternator output for increased fuel efficiency? If so, this may explain the flickering. Check your battery and alternator output. Anyone around you with a Tech2?

That's a GMT900 thing.

 

[bluebear15]

That's a GMT900 thing.

So not my 2006 Tahoe Z71?

 

[bluebear15]

Is your alternator still good?
If it's a straight road I wouldn't think the adjustment wheel would be a problem. Almost sounds like it's losing power to me.

Haven't checked my alternator yet but I will.

 

[Rocket Man]

So not my 2006 Tahoe Z71?

No, it's a GMT800 and that function doesn't apply to your truck. That's a feature of the 07-14 GMT900's and later.