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BobNorman BobNorman is online now
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Join Date: Feb 2020
Location: Newfoundland
Posts: 121
Garage
A call for advice once again. I thought I’d just post it here rather than starting a new thread.

I’m getting ready to install the engine in the car. I have secured the proper clutch plate and disc to mate the 911 transmission to the SC motor, and have gathered pretty much everything else that I think I’ll need.

I have a wiring harness and fuse panel from a 1970 911S, and have mostly sorted out what wiring is needed. With no FI system things are much simpler. I do have a distributer from an ROW SC, which I’m told will work well with the carbs.

The only thing I’m confused on is the CDI. I was told somewhere along the way that I would need a 6 pin vs the 3 pin that the car would have come with. I have a 6 pin unit, but am unsure how to wire it up to my existing set up. There are two wires (Blue/Yellow & Brown) in a three pin female connector on the panel which I think go to the old (3 pin) CDI unit.

I guess my question is twofold:

1. Do I need the 6 pin CDI, or can I just use the 3 pin that would have played well with this harness?

2. If I have to use the 6 pin unit, does anyone have a simple wiring diagram to show me how to wire this? I have the two wires in the three pin female plug mentioned above, I also have the green wire from the SC distributor, that I know comes into play, and I know there would be a red power wire in there somewhere, as well as a wire from the coil. On my engine harness I have a purple black wire that the 70 wiring diagram tells me goes to the distributor, and then to the tach? I think this come into play as well.

Any advice here from anyone who may have done this before is most welcome.

Thanks,
Bob
Old 01-10-2024, 11:34 AM
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