red wire to hot side of coil...black wire to negative side of coil...make sure coil is getting full 12 volts...remove ballast resistor and connect those two wires together..and run another wire to hot side of coil to provide the full 12 volts..

got one in a 88 dodge d250 runs great..

Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)