First you need a 12v lamp in a holder or get someone to solder two wires to one, next disconnect the earth lead of the battery and connect the lamp between the battery and earth if you have battery drain the lamp will glow brit the less drain the less the lamp will glow, remember you will always have a bit of drain, now you can remove a fuse at a time and look at the lamp if it glows less this could be the circuit that's at fault. Good luck.
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