Quote Originally Posted by Joe S. View Post
I used a Bosch relay on a 71 chevy to power an HEI ignition and the relay would hold down to 3volts which was low enough to allow engine to run when switched off due to receiving power through the alternator light, had to kill engine in reverse gear, where the backup lights would load it enough to cutoff relay.
LOL! I had the exact same thing happen on my 72 Nova. When I converted it to EFI, the ECM, ignition, and everything else was powered by a relay that wouldn't drop out until the alternator was unplugged. Fixed that by installing a diode in the alternator warning lamp wire.

It was kind of nerve-wracking because the engine was a newly rebuilt one I had put together, and wired everything up. The first time I turned the key, it started instantly, and the transmission started spewing oil profusely from a forgotten cooler line, and I couldn't shut it off!!!!

David