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Toyota tundra weird electrical problem, draining battery while I sleep

2004 Toyota Tundra runs and cranks great, but when left overnight, won't turn over and i have to jump it. battery is good. something is discharging the battery overnight. everything electrical seems to work fine. hmmmm. any ideas?

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There could be a light on that you aren't noticing. There could also be a short in the wiring some place. To narrow down the problem you would put a multimeter set to the highest amperage it has in series with the battery and remove the main fuses one at a time until the current drops to approximately 0.2 A or less. That's the circuit the short is on. This should be done with the key off and the doors closed. The owner's manual should describe what each fuse is for. Is there an under hood light on that vehicle? It could be bent into a position that leaves it on.

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awesome! thanks Josiah. i cant wait to try this.

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