Quote:
Originally Posted by StephenVA
Basic test and diagnostics
When your car battery goes dead overnight, usually either the battery is at the end of its life span, or you left something on, such as a light. Occasionally something is drawing power that's not of your doing. This is a parasitic draw, and it can cause the same result as leaving the headlights on: a dead battery in the morning.
1. Remove the negative side battery cable from the negative battery terminal.
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8. Repeat steps 1 & 2 to test your repair. The ammeter will tell you the exact numbers.
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Great stuff, generic instructions for almost any car.
What are the best ways to do all the above on an E53 while dealing with the battery in the trunk and the sleep mode? Will the rear hatch being open prevent sleep mode? How to turn off courtesy lights, alarm?, etc.?
Alarm off, doors and hatch closed, lying on the folded down rear seats, reaching down into the battery area, ... ? Or something else?
I expect there are some clever things to make this easier than it seems.