sbc engine run on. (Page 1/1) Tappy350 SEP 08, 08:24 PM Got my old school sbc swap running but having engine run on issue with a MSD ignition. Engine will continue to run with the ignition off. MSD recommends a one way diode on either the "brown" alternator wire or the charging lamp indicator. I'm not sure where I should install the diode on an 88 Fiero with stock alternator. Is there a wire on the alternator harness I have to tap into or can I tap into the voltage gauge? not good at wiring so speak slowly jelly2m8 SEP 09, 04:06 AM Its wired wrong, the coil power needs to be wired to the Ignition switch directly, Pink wire from the original harness. Tappy350 SEP 09, 09:06 AM That would be great news I’ll look into that today Tappy350 SEP 09, 02:28 PM quote Originally posted by jelly2m8: Its wired wrong, the coil power needs to be wired to the Ignition switch directly, Pink wire from the original harness. That took care of the issue thanks again!