what causes the voltage to fluctuate on the battery and lights flash on my 2002 GMC Sierra
May 21, 2011 at 3:29 PM
fluctuating voltage
2000 GMC SIERRA
GMCBLUZ
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Test the charging system. Battery has a full charge and all connections, clean and tight?
May 21, 2011 at 3:57 PM
yes, first thing i checked
May 21, 2011 at 4:07 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?
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?
May 21, 2011 at 4:23 PM
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