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a short would blow a fuse, maybe your alternator isn't up to the task, drive it by orielly and seen if they can load test it. if it's the original alternator and now you added a bunch of accessories (EX. Cd ignition, electric fans, fuel pump etc) it's just not giving enough amps, also the alt feed wire must be upgraded to supply more amps as well, powermaster says it's kind of like drinking a thick milkshake through a coffee stirrer, bigger alternator means bigger supply wiring. as far as a big big loud electric fuel pump, good luck even the so called quiet inline pumps are noisy, trust me on this I have tried the holley rotor style, the edelbrock quiet vane type and just about all are noisy, some are better but none are a walbro Efi in tank pump, which by the way is quiet. good luck there, oh yeah I have isolated them in every imaginable insulator too!