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Re: need help hope this is the right place for this.99 yukon battery drain.
Sometimes the owners manual will tell you what the fuses and relays do. If no manual is available, its time for some trial and error
Put the battery in and put in all fuses and relays except for these 3 50-amp fuses and start trying all the circuits, switches etc to see what does not work.
In my experience, the only fuse-protected circuit that can create such large draw (without obviously doing something) is the starter motor relay (or solenoid) or the ignition circuit.
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