electrical drain

cudajim said

I would use an ammeter instead of a light bulb in series with your battery cable to see how much current you're pulling. You may be pulling low milliamps which may not show up with a light bulb. I do agree that by pulling fuses you should be able to narrow down where the current draw is going.

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You ALWAYS want to start FIRST with a lamp. This is because, even if using the highest current scale on your meter, if the load "just happens" to be more than the meter can handle, you can blow a meter fuse, or even damage the meter.

But even if just using a typical 12V store--bought test lamp, most of them will glow at very little current---useful in most situations.

I did not say anything about using a meter because I wanted to keep "the start of things" simple.