The following is the method I always use (requires a non-powered 12 volt test light):
1) Turn off all electrical loads, close all doors, and remove the lightbulb from the underhood light, if equipped.
2) Disconnect the negative battery cable from the battery.
3) Attach the alligator clip from your test light to the battery cable post clamp.
4) Touch the tip of the tester to the negative battery post.
The test light should light, but be dull. If the test light is bright, you have a drain somewhere. You will need a helper for this next part.
1) Have an assistant hold the test light exactly the way it was when you did the previous test.
2) Climb inside the car, and get yourself into a position so that you can access the fuse panel with the doors closed.
3) Remove one fuse at a time, and have your assistant alert you if the test light dulls.
4) When it does, note which circuit the fuse was for, and start searching the loads on that circuit.
Take care,
-Chris
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