'68 Fastback, 392 EFI stroker, AOD, IRS
I bought used Pro-Flow system #3541 for my 68 Mustang. Unfortunately It lacks an ignition amplifier and its harness. I bought a replacement Delco ignition module. I need help in hooking it up to the ECU. There are 3 wires coming from the ECU - red, white and grey. I figured out that red wire supplies power to the ignition module and the coil (+). White wire goes to S(spark) pin of the ignition module. Coil (-) connects to Coil pin of the ignition module. V(-) pin of the ignition module goes to ground. What do I connect gray wire to? There are no schematics of that part in the manual, just a picture of its harness. Can somebody enlighten me?