Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Have you narrowed down the short to a particular fuse yet?
I don't know what you mean by testing the fuses, but that isn't the way to narrow it down. You have to hookup and ammeter to the disconnected negative battery terminal and get a reading. If the reading is over 50mA then that will drain the battery. You may have to wiggle wires, etc or just wait until the battery drain is there, cause there is really no way to test without it being there. Then once the battery draw/drain is over 50mA, start removing the fuses one at a time looking at the ammeter after pulling each fuse until the battery draw/drain drops below 50mA, then get a wiring diagram of that fuse's circuit and hook the battery back up and see if anything on that circuit don't work. If something don't work, then use a voltmeter and find out where it has voltage and then suddenly looses voltage and right there between that spot and the last spot you tested should be the short, so inspect the wiring or whatever for a short to ground or shorted circuit to another circuit and repair it.
Once you narrow it down to what fuse, let me know and I'll upload the wiring diagram.