1997 GMC Sierra checking alternater

1997 GMC SIERRA
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JAZEE
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Electrical problem
1997 GMC Sierra V8 Two Wheel Drive Automatic

can i check my alternater by disconnecting battery cable while engine is running?
Mar 4, 2010 at 5:02 PM
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RASMATAZ
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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-
Mar 4, 2010 at 6:21 PM