Quote:
Originally Posted by djnolan
When the dome light switch is tripped when you exit the car it shuts off the window relays and the radio. If your dome light switch is bad then that window relay and radio will stay energized and that will drain your battery down. When you check the current drain at the battery as described you won't find this. This allows you to run up your windows after you turned off the engine.
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Dome light switch has no relation to controlling door-relays or radio. It's the door-switches that provides that function to turn off dome-light, door-relays and radio. Frayed wires to the dome-light will cause short to the body regardless of the position or condition of the dome-light switch.
Uh, if you disconnect your battery cable, where is the power that the stuck window relay and radio is draining coming from?
Or to put it conversely, if you have an unknown short that's draining the battery and you disconnect the battery, will the battery still run down in the course of a week?
By disconnecting the battery cable, and bridging the gap with the voltmeter, ANY and ALL current flow MUST go through the meter. If there's a short, regardless of where it is, that current will register on the meter.