Lights dimming while sitting at light,alt gauge goes way down.

Asked by Feb 04, 2014 at 06:44 PM about the 2006 Chevrolet TrailBlazer LS

Question type: Maintenance & Repair

Lights dim when at red light, gauge goes way down, when I step on gas gauge goes up
and lights ok. Doesn't happen all the Tim. Have new battery and changed alt 3 times. Any
ideas. Thanks

3 Answers

Sounds like bad alternator. If I'm correct that gauge should read 14 volts, roughly.

Found the problem. Noticed the RPMs were down to about 500 and should be a little over 600. These alternators have a saver mode if rpms are too low. Cleaned the throttle body which brought the rpms up to where it should be and have not had a problem since

I have the same problems with my 2006 trailblazer LS lights blinking when I first turn the car on when im just setting still I change the alternator twice and it still doing the same thing and sometimes when I put it n reverse it shout off somebody please tell me what WRONG

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