I have a 2008 Silverado Ext. Cab 4.8L. When my truck is running, all lights flicker (dome, dash, headlights, taillights). I've checked both battery and alternator at Autozone and both were fine. What can I do to fix this?

10

Asked by Mar 15, 2015 at 06:12 PM about the 2008 Chevrolet Silverado 1500 LT1 Extended Cab

Question type: Maintenance & Repair

9 Answers

7,175

Check for loose connections at battery Both positive and negative, and condition of cables, loose ground at block or at starter.

10

I just finish checking all cables and even added a ground, but still having issue. "Service Engine Charging System" light comes on and ac pulses as well.

62,175

IT will be the alternator voltage regulator biult into the stater,it will show charging but it will power surge,meaning flickering light,s---over charge,rplace alternator.or have it rebiult,and request a new voltage regulator be put in it.

1 out of 1 people think this is helpful.
10

So, you're suggesting to replace the alternator, just to verify?

7,175

Have it load tested first.

62,175

Load test will show charging,that,s not the problem,normal load is 13.5 to 14,,amps,,they will just say it,s good,it will show a slight surge prolly about 14.3 amps or better and will flucutate,yes fix the alternator,or replace it with new one.

2 out of 2 people think this is helpful.
10

Hey tst...that fixed the issue...thanks!

1 out of 1 people think this is helpful.
62,175

You are welcome,

I have an 08 and I have a similar problem. My voltage regulator keeps going out in the alternator. Ive been through 7 alts in about 9 months. What can I do?

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