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Old 01-08-2019, 01:21 PM   #5
SilverMiner
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Join Date: Oct 2005
Location: North Idaho
Posts: 275
Re: Unfused battery drain

An update to close this thread -

The headlight switch was not the source of the drain. Also as a note to others who may read this in the future, I was wrong to think the AC duct below the steering wheel required removal. Simply unscrewing and moving the lower left dash vent allowed access to the headlight knob button.

I now believe the drain is due to the door switches for the interior lights although I can't prove it conclusively. The switches appear to be in poor condition or I'd test to see if removing them solves the problem. The measured drain changes slightly as I repeatedly open and close the doors. I was able to get the drain dropped to below 0.50 amps (how? don't know - magic maybe), which shouldn't be enough to kill a good battery just overnight. I'm running a Hellroaring dual battery setup that allows me to "self jump" so until the weather improves and new switches arrive I may just live with the situation.
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1980 K10 Suburban Silverado, original 350 w/Qjet swapped to 406sb, TH350C swapped to TH400/205
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