MSD box install in a 911 SC

[kamaro]

I'm trying to help a friend to install a MSD box (6425) to his 1983 SC, I searched all over the place to find a description of which wire goes to where in the 6 pin CDI plug but I didn't find anything useful for this application, can some please explain the connection layout to hook the MSD box to the stock 6 pin CDI plug in the body harness?

Thanks!

[tirwin]

MSD street fire in 78sc

See post #16 by timmy2

I think the wiring is the same for the Streetfire and the 6AL.

[tirwin]

And then have a look at post #22. Note the comment about possibly having to swap the green and violet wires.

MSD street fire in 78sc

[kamaro]

Originally Posted by tirwin

And then have a look at post #22. Note the comment about possibly having to swap the green and violet wires.

MSD street fire in 78sc

Thanks!, exactly what I was looking for.

[GG Allin]

Originally Posted by kamaro

Thanks!, exactly what I was looking for.

Dennis is incredibly helpful.

[SkunkWorks]

^ Amen.

Dennis also sold me the connector and pins necessary to plug the Streetfire box directly into the 6 pin CDI connector.

[et cetera]

I had a quick question on the install as well.

I'm supposed to clip the red hoop wire that hangs out the bottom, and leave the blue one alone, right?

Its in the MSD instructions, but I never see it mentioned in the hundreds of posts I've read on the install.

[tirwin]

Originally Posted by et cetera

I had a quick question on the install as well.

I'm supposed to clip the red hoop wire that hangs out the bottom, and leave the blue one alone, right?

Its in the MSD instructions, but I never see it mentioned in the hundreds of posts I've read on the install.

That is correct.

Good point it is never mentioned. Just follow MSD instructions for that.

I also set the rev limiter in the MSD and disabled the factory rev limiter. Don’t want competitive processes trying to do the same thing.

[tirwin]

Also, I seem to remember a post I made a long time ago about a way to easily test for spark. I think it involves the white wire that you cap off. I think it was something like you could ground the white wire to get the coil to fire. Handy if you ever have to troubleshoot weak/no spark condition. But for the life of me I can’t remember the details. LOL

[et cetera]

Originally Posted by tirwin

Also, I seem to remember a post I made a long time ago about a way to easily test for spark. I think it involves the white wire that you cap off. I think it was something like you could ground the white wire to get the coil to fire. Handy if you ever have to troubleshoot weak/no spark condition. But for the life of me I can’t remember the details. LOL

Haha, I defiantly read that post at one point. Thanks for the help!