I Might Just Know What I'm Talking About
Join Date: Jan 2000
Location: Charleston, South Carolina
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Re: Battery going dead overnight
I was gonna suggest the same as James. Basically, with your key off you shouldn't have any power being used. If you have inline fuses (especially the newer FLAT fuses) you can see a spark when you pull a fuse that's in use. That'll tell you what circuit is using power. Then it's up to you to find out why. But that's usually a HUGE step in the right direction.
If you have the older glass fuses, you could use a meter to see if the circuit is using power, but that's a little out of my league, so I'll shut up now.