Re: Drawing power somewhere unknown
The easiest way to troubleshoot a battery drain is a test light installed between a battery cable and battery post. The slightest current draw will make the filament glow, as can be viewed in a dark garage.
Aftermarket radio will draw some current to run clock, station memory, and audio presets.
Other than the a/mkt radio, some amps and modern electronics draw power if wired incorrectly.
The most common draw is from a courtesy light not seen in the daytime, like a glovebox light or trunk light. Rarely but does happen, the junction block next to the battery, having the positive pigtail attached to it, does rust underneath, the stud has a high resistance to the radiator support. removal of the block is required to check.
Alt diodes can go bad, so a disconnect of the BATT wire on alt stud will tell.
Do the most obvious to eliminate the current draw, as in pull fuses, unhook added accessories, and whatnot.
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