FLUCTUATING VOLTAGE

2000 GMC Sierra

Tiny

gmcbluz

May, 21, 2011 AT 3:29 PM

What causes the voltage to fluctuate on the battery and lights flash on my 2002 GMC Sierra

FOUND 3621 RELATED QUESTIONS

Not Charging Battery

34 ANSWERS
13 IMAGES

Battery Will Not Charge

20 ANSWERS
5 IMAGES

3 Answers

Tiny

JDL

May, 21, 2011 AT 3:57 PM

Test the charging system. Battery has a full charge and all connections, clean and tight?

Tiny

gmcbluz

May, 21, 2011 AT 4:07 PM

Yes, first thing I checked

Tiny

JDL

May, 21, 2011 AT 4:23 PM

I did look at your TSBs, one of them said, "this is normal unless there is a proven fault".

I know that doesn't help much, did it just start doing this or has it been doing this all along?

With engine running, warm idle, all electrical loads turned on, what is the voltage reading across battery posts as compared to alternator bat terminal?

Are you saying, your headlamps go out?

Please login or register to post a reply.

Battery Replacement Ford Escape 2000-2006
Battery Replacement Honda Civic 2006-2011
Battery Replacement Ford Contour 1996-2000
Battery Replacement
Battery Replacement Guide