Pertronix conversion for a 914 Six

[RSOHC]

I need clarification on how to wire a Pertronix conversion in a 914 Six.

I understand that: (1) the black wire from the Pertronix unit should attach to the
negative coil post.
(2) the red wire from the Pertronix unit should attach to the
positive coil post.

What is the source for the 12 volts needed to attach to positive coil post? Is it the wire going to the distributor points?


Also, in the factory installation with points, why is there a coiled wire going from the negative coil post to ground? What is the purpose of the wire connected to the positive coil post?

[RSOHC]

Parts Klassik offers a wiring harness (part number 911.612.050.PX) that allows the installation of a Pertronix system with a 3 Pin CDI which is what I have in my 1970 914-Six.

[RSOHC]

Here are the results of the consultation with the person who designed the wiring harness. The wiring harness sold by Parts Klassik is only needed if the current harness in your car is not functional and and the wiring harness wires are too short to be used in a 914 six. Here are the instructions for using the existing factory wiring harness.

The red wire from the Pertronix unit needs to be attached to a keyed 12 volt source. This can be found at Pin1 of the 14 pin connector which is 12 volt only with the key on.

The black wire from the Pertronix unit needs to be attached to directly to the black wire in the existing wiring harness where the points are connected.

Lauran

[Dave at Pelican Parts]

There should never be a wire from any coil terminal to ground. One on the positive terminal will pop whatever fuse supplies power there. One on the negative terminal will keep the coil from ever generating a spark.

I don't know how a Pertronix interfaces with a CDI specifically, but when it is put into a regular ignition system the red wire goes on the coil (+) terminal and the black wire goes on the coil (-) terminal, replacing the wire from the points/condenser.

The four-cylinder cars have another wire that hooks up to the (-) terminal. This wire (black/purple) carries the points signal to the tach. I think the six-cylinder cars have something similar, but I'm not sure.

--DD

[RSOHC]

Tech Tip numbers 593 and 597 of Dr 914's 700 Tech tips states that "the negative side of the 914-6 coil is grounded to the engine." My 914-6 has a brown wire that goes from the negative side of the coil to the stud and nut that hold the 914-6 coil bracket to the engine housing.

Lauran

[RSOHC]

Here are some additional diagrams to add to the discussion.

[RSOHC]

Here is the other diagram

[RSOHC]

Here is another diagram

[Dave at Pelican Parts]

Dave at GPR? Wow, it's been a while since I've heard that name. RIP, dude.

It looks like the CDI controls the spark through the (+) terminal of the coil rather than the (-) terminal the way the regular points-and-condenser one does.

--DD

[RSOHC]

Here are some more Pertronix instructions