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Old September 12th, 2020, 04:21 PM
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m38inmaine m38inmaine is offline
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Join Date: Jun 2014
Location: Eastern Maine
Posts: 262
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Get a decent multimeter, set to amps, unhook the positive lead of the battery, attach one lead of the meter to the battery post and one to the lead you removed, sort of like using your meter as the battery connection, see what the meter says, that will tell you if you are drawing current when the truck is off. One common suspect is the alternator, a diode can go bad allowing it to draw current when the truck is off. If you see it drawing current, try disconnecting the alternator first ad see if the draw goes away, if not I would disconnect the connector from the back of the light switch next.
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