Taz, do take a look at adding a diode to the pull of the solenoid. You can get voltage spikes when the field collapses that your alternator or stereo equipment may not like. Ask pop about that. All I know about it what I read but it does seem possible.

O'l Dad said the amount of amps generated from a relay coil of this size is minimal. You plan to put the relay between the key and the ignition coil right? The starter solenoid does not need the relay.

I put my relay in Sat. next to the ignition coil and it took care of my high end breakup.

Stumbled on BadDog's thread from 3+ years ago. It is somewhat applicable to my ignition problem posted in another thread on here. I do not seem to be getting a "clean" 12V at my coil, after the purple wire has to run its tortuous path back from the ignition switch, lanyard, gauges, etc. The relay sounds like a much cleaner solution to me. My question: I just installed a relay to run the fuel pump, which is in fact triggered from the purple wire on the coil. Couldn't I just tap another power line off of the "big" side of this relay? It would eliminate another component that could possibly fail. A 12 or 10 gauge wire running 2 feet or so from the relay up to the coil would have to be cleaner than the way Merc does it. I can't see the coil robbing enough amperage from the FP circuit to matter.

Any opinions?

Anyone?