Starter Solenoid wiring for coil

[Hawssie]

Its been quite a few years since I remember doing this but I know the stock type starters on these trucks have two small terminals on the starter solenoid, with one for cranking and the other for powering the coli if I remember? I think it had to do with allowing the coil to see 12 volts during cranking? Anyways I am now replacing a 1970 307 with gm crate motor. The crate motor has a larger diameter flex plate which meant the stock starter wont fit anymore. I cant swap flex plates because the bolt pattern diameter is different between the old motor and the new later model one. So I bought one of the high torque starters for it but it only has the one typical terminal for cranking> What should I do with the extra wire so everything will still work?

[FirstOwner69]

When you say "GM crate motor", is it actually made by GM. If so, I thought they all come with an HEI distributor. If so, there is no coil, and you'll need to do a bit of rewiring. There's lots of info on the forum that'll help if that's the case. I was doing this today with the GM Performance Parts engine I'm installing... and hoping I did it right!

[SS Tim]

Your crate motor has a points ignition? With an HEI type ignition system you use a full 12v all the time. The points coils used the starter circuit as a spark helper during cranking but dropped back to the resistor ~ 9v wire in the ignition run position.

[Hawssie]

Well it was a incomplete crate motor. It now has a MSD system with a MSD distributer a 6AL Ignition controller MSD standard type coil(looks like a stock style coil). The distributor is not a HEI clone. What I am really looking for is a wiring source for the 12V for the Pos coil side. It would normally just be acc 12volts but that brings me to that solenoid wire. I thought I remembered there was a problem getting 12 volts when cranking on these trucks. Maybe there isn't. I was trying to figure out where to get 12v during cranking and when key is on.

[Hawssie]

OK so that extra wire is just for points style distributors?

[LockDoc]

Originally Posted by Hawssie

OK so that extra wire is just for points style distributors?

Yes. The yellow wire from the solenoid to the coil can be removed tor the HEI. It provided a full 12 volts to the coil for the points distributors, when the key was in the "start" position .

LockDoc

[Hawssie]

Thanks