5 years ago I did a frame off resto on my 69 Camaro. MSD 6AL Ignition, C130 (2 wire) Alternator, 4 Pin GM HEI distributor all wired as per MSD install instructions for GM 4-pin Module as on page 16 of MSD instructions, no diode was ever needed in the "GEN" light circuit. For the last 5 years I've never had Run On. Went racing Wednesday night and now I have run on. Turn key off and engine keeps running, "Gen" light comes on. Only 2 ways to shut off is to trip my Kill switch (Theft Deterrent switch on white wire as shown on page 6 of MSD instructions), or to put the trans in reverse. I have a 200-4R trans with a B&M shifter which uses a neutral safety switch. The only relays I used are for the head lights and I brought power directly from battery + as per relay instructions. So why after 5 years do I now get Run On????? Why does it shut off when trans goes into Reverse? What am I missing here?