Question about 1996 GMC Savana
To check for a parasitic drain, you will need a multimeter. with battery fully charged, remove negative cable from battery. set meter to 300mA and put negative lead on the battery's negative post. put positive lead on vehicle's negative cable and check meter reading. usually, there's an initial draw for a short time (1 or 2 seconds) for the vehicle'ssecurity system, relays, etc. after that, it should only pull 30-40 mA or so, for the digital clock, radio settings, etc. if you're seeing higher numbers, try removing the main fuses (under hood fuse box) one-by-one to see where the problem is. it's also possible that a diode has gone bad in your alternator, which will draw current when the vehicle isn't running. you can check this by disconnecting the alternator's electrical connector to see if you notice a difference on the meter.
Posted on Feb 05, 2010
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Posted on Jan 02, 2017
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