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Simple battery draw test 120-130

posted by  planetman on  Sun Oct 13 09:04 CST 2013
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last visit: Fri Oct 24 09:29 CST 2014
[RELATED]

You can test for a parasitic draw by using a 12 volt test light.

The procedure is as follows:

1st, make sure the ignition is off and all lights are off including the dome light. Then test your test light by connecting it to a known good battery.

Remove the negative battery cable from the battery, then attach the test light clip on connection to the removed battery cable and then touch the test probe to the negative battery terminal. If it lights up brightly, you have a large draw, if it lights up dimly, you have a low draw and of course if it doesn't light up at all you don't have a draw or you have bad connections.

If you have a large draw, try removing the longer fuses 1 at time to see if the draw goes away.

I you have a low draw, that might be caused by a modern stereo, alarm system or clock if you have any of those installed.

FYI, don't try this procedure using a volt meter as most of those can't handle the amperage.
--
Eric

Hi Performance Automotive Service (formerly OVO or Old Volvos Only)

Torrance, CA 90502






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