Wiring to the ignition coil, Help sorting out the wiring please Options

[TonyH]

Good afternoon everyone,

And a Happy New Year to you all.

I have a 1975 ex California 914/4 which I am in the process of getting ready for the road. I have original Model 72 colour wiring diagrams which I have enlarged to make life easier.

My question, The diagram wiring for the coil, does not make sense to me compared to my own car. Needless to say a previous owner/garage has been messing about with it.

The diagram does not show any negative or positive but it appears on the diagram that terminals 1 & 4 (Number 1 green goes to the distributor/condenser) ( Number 4 black must be the H/T lead) So I am guessing number 1 must be negative terminal.

So am I right in thinking the black and purple wire on the negative number 1 goes to the tacho?

Any help or advice would be greatly appreciated.

For all the people in Southern California the rest of the world is thinking of you all.

[ClayPerrine]

Good afternoon everyone,

And a Happy New Year to you all.

I have a 1975 ex California 914/4 which I am in the process of getting ready for the road. I have original Model 72 colour wiring diagrams which I have enlarged to make life easier.

My question, The diagram wiring for the coil, does not make sense to me compared to my own car. Needless to say a previous owner/garage has been messing about with it.

The diagram does not show any negative or positive but it appears on the diagram that terminals 1 & 4 (Number 1 green goes to the distributor/condenser) ( Number 4 black must be the H/T lead) So I am guessing number 1 must be negative terminal.

So am I right in thinking the black and purple wire on the negative number 1 goes to the tacho?

Any help or advice would be greatly appreciated.

For all the people in Southern California the rest of the world is thinking of you all.

Tony,
The black/purple wire is the tach lead. The solid black wire is the power to the coil So you attach the black wire to the coil positive, and the black/purple wire to the coil negative. Attach the green points lead to the coil negative.

If your harness has been butchered in the past, I would suggest a bowlsby ignition harness. 50 year old wire that has been heat cycled on top of the motor causes the wiring to crack and break. And that leads to "THE RIDE OF SHAME"... aka, the tow truck. Getting a bowlsby harness means all the wires are new, and everything is properly color coded. So it is literally plug it in and go.

https://bowlsby.net/914/WiringHarnesses/

Hope that helps!