1997 GMC Sierra checking alternater

JAZEE

MEMBER
1997 GMC SIERRA

Electrical problem
1997 GMC Sierra V8 Two Wheel Drive Automatic

can I check my alternater by disconnecting battery cable while engine is running?

Thursday, March 4th, 2010 AT 5:02 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Bad idea disconnecting it can cause an overload-Use a voltmeter and read the voltage of the battery while engine is running should be 13.5-15.5 volts if the alternator is doing its job-

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1997 GMC Sierra checking alternater

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