Parastatic battery drain? How to find?

Asked by Jul 23, 2015 at 03:56 PM about the 2006 Pontiac Montana SV6 Base Minivan

Question type: Maintenance & Repair

I have a parastatic draw on my battery at 1.750 (avg) before I pull fuses. I can get it down
to .231 amps if I pull about 4 fuses from the interior fuse panel. If I start putting any of
these back in, it goes up to about .360 amps or higher. Help please?

1 Answer

86,905

Do not use an amp gauge to find a draw, use a test light between a battery terminal and cable end, if the light turn on bright then you have a draw big enough to kill a battery overnight, the very first thing to electrically disconnect is the alternator, if the light is still on bright then remove the fuses one at a time until the light goes out, then find out what component on that circuit is causing the draw, repair or replace as needed, then start putting the fuses back in. Note about parasitic draws, most of these in American vehicles will cause the test light to glow slightly, then on some vehicles, but not all, the glow will slowly diminish.

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