Make sure you have your voltage regulator harness connected as well. When I reversed my wires I had a no start situation at first. I traced the power flow through the ignition wires and discovered that the 4-pin connector for the v-reg harness has to be connected to complete the circuit. I put in a jumper wire and all was well. I did not have the harness connected as I am running a one-wire alternator with internal regulator. I am also running an MSD HEI distributor and have the brain box completely removed so I don't think the brain is your problem. Mine works fine without it. Just a thought...