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You can narrow it down to a system or so by testing for continuity at each fuse in the fuse box. Once you find the fuse with current you know its somewhere in that circuit.
When did this issue start for you or has it been like that since you got the car. If you can pin point a time it started, then look for what might have changed to possibly cause the draw.
If not a daily driver you may think about a battery disconnect and a trickle charger .
Last edited by johnt365; Aug 23, 2012 at 06:12 PM.
Drawing 5a with car turned off: Something is shorted to ground.
Don't waste your money on a tickle charger or a battery disconnect UNTIL you find the problem. Then add extras.
5 amps is a very large draw, and a fully charged battery won't even make it a 1/2 day. You need to find the problem, as if the battery goes totally dead, it's usually a goner for good. You can connect an ammeter inline for testing, or get hold of a clamp on DC ammeter, while pulling fuses, or wiring connections. Having another person to help, is a good idea. Make sure you remove hood and dome light bulbs when doing this.