Fluctuating voltage

Tiny
GMCBLUZ
  • MEMBER
  • 2000 GMC SIERRA
  • 6 CYL
  • 2WD
What causes the voltage to fluctuate on the battery and lights flash on my 2002 GMC Sierra
Do you
have the same problem?
Yes
No
Saturday, May 21st, 2011 AT 3:29 PM

3 Replies

Tiny
JDL
  • EXPERT
Test the charging system. Battery has a full charge and all connections, clean and tight?
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Saturday, May 21st, 2011 AT 3:57 PM
Tiny
GMCBLUZ
  • MEMBER
Yes, first thing I checked
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Saturday, May 21st, 2011 AT 4:07 PM
Tiny
JDL
  • EXPERT
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?
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Saturday, May 21st, 2011 AT 4:23 PM

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