LSx guys, help...... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

"OK, i finished all the wiring on my 71. turned the ignition on and didn't have any power to the pcm. I checked my fuse for the pcm and it was popped. I replaced the fuse and it popped instantly. Pins 20 and 57 on the red connector are the pcm main power. these wires are run to a 20 amp fuse then to the battery. this is the fuse that's popping. not sure why, any ideas??"