LS1 Ignition On & Start Relays

[dave w]

Excellent idea, these should work https://www.mouser.com/datasheet/2/4...ries-63289.pdf

I'm likely going to use relays, available at Auto Parts Stores. It's an automotive application.

dave w

[lionelhutz]

Use smaller diodes like a 1N4007 to power one relay.

[tayto]

I know this is an old thread but I thought I'd add my 2 cents. When I converted my '64 Impala to TBI 10 years ago I only remember having to tap into the purple starter wire (used the "R" terminal on the starter) for a CRANK signal. I recall metering out which IGN wire/circuit stayed hot even while cranking. Pretty sure even TBI requires 12V IGN and CRANK for starting. I would buy a new ignition switch and ring it out, it sounds like the current one has a bad contact. You might even be able to disassemble the old switch and clean it up.