2 wires to the positive side of the coil

[BBclassic]

Hello Everyone

In my car a 1970 911T there are 2 wires going to the positive side of the coil. One connected to the CDI and another is green or blueish & yellow what is the second one for, it is connected to the 14pin connector on the back of the fuse box near the end of the car.

Thank you

[ischmitz]

Tachometer?

[timmy2]

1970 wiring only, the second blue/yellow wire going to the 14 pin connector runs through it to the "Intermediate Unit" item 10 on factory print SL35, and from there to the tachometer.

[BBclassic]

Thank You very much Timmy2

What is the use of the intermediate box #10 ? There is no speed switch in a T
I have installed an MSD yesterday what do I do with the second wire at the coil (the one to the intermediate box) ?

Many thanks

[timmy2]

You can leave it disconnected. Porsche used the same harness in every model (T,E,S) and just left wires and connectors disconnected and taped off in the harness if not used. Just ensure your tach wiring is correct for the MSD.

[BBclassic]

Thank You !