Why does my battery lose power when I turn my lights or heater on ??

10

Asked by Jan 20, 2013 at 11:44 AM about the 1994 GMC Sierra 1500 C1500 SLE Extended Cab LB

Question type: Maintenance & Repair

4 Answers

107,305

I would check and clean all battery connections positive and ground. Check ground connections to frame and motor. Check voltage coming from alternator to insure it is putting out somewhere around 14 + volts.

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94,855

Some power loss is normal. Some dimming of the lights can be seen when other loads are turned on. Check the alternator output as dandy said. --- Do you lose all power or a lower voltage?

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Best Answer
10

Thanks it was the alternator.. it was putting out enough just to pass all other test except the multi meter it caught it..

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i ran into the some problem, head lights and heater on,on a 1992 chevy c1500, i have great voltage and clean battery connections positive and ground, any one have any ideas on this problem i am having thanks brian

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