Help with Pertronix Ignitor II

[dm36415]

I've read many previous posts on this, but am still confused. I now realize my first mistake was to install the device by relying on the instructions included with the device, rather than consult this forum.

Baseline, car was running fine prior to installation, now it won't fire after installing the Pertronix Ignitor II and recommended Flamethrower II coil.

First, I have attached a picture to make sure I installed the device correctly. Seems like the magnetic sleeve is low, but this height is required to give the necessary clearance for my rotor to fit on. Please let me know if this looks correct.

Second, the wiring. There has been much guidance on the wiring, but here is where I'm really confused. Original wiring had a tan wire connected to the positive side of the coil, and a tan wire connected to the points. Black wire was connected to negative side of the coil, and negative side of coil had ground wire attached also.

Please help!

[haycait911]

have you seen this? http://www.pertronix.com/tech_support/assets/Porsche_CD_diagram.pdf

[dm36415]

I did, but I'm still confused. Any way you can map previous wiring from the CD box, so I can figure "what went there, now goes here"?

[haycait911]

when I did mine I made up a new harness so I can't really tell you what connects to what. do you have a factory color-coded wiring diagram? in haynes or factory manuals. as far as your wheel being too low, mine looks similar(pertronix I). you could probably take a little off the bottom of your rotor if that's the problem. but I would make sure you've got the wiring sorted out first. Don.

[dm36415]

I don't have a factory wiring diagram, but thanks for the photo. It helps to reassure that the installation piece is correct. Instructions indicated that bottom of magnetic sleeve should align with the bottom of the sensor, but I just couldn't see how that was possible.

I agree, I'm pretty convinced that the problem lies with the wiring. I'm a newbie, but have always found the information necessary to complete my tasks available in assistance from the good folks on this forum.

[haycait911]

try this from our host's site. # 9 is the cdi. the 1973 diagram should work for your cdi. I find the later 'current flow' diagrams more confusing. I tried to scan one for you but it comes out unreadable. Don.
http://www.pelicanparts.com/911/911_Parts/Electrical/911_electrical_1973_CIS_Part2.jpg

[dm36415]

Let me see if I have this right. I am assuming that the A,B,C wires from the CDI all emanate from the same single plug, that the other plugs are D and a ground. My middle wire (I assume it's the B wire) is red, and the other two are both tan.

1. The red wire from the CDI (B) connects to the Ignitor Red wire (I don't see an existing connection, I'll need to splice it in)

2. the CDI (A) connection goes to the positive side of the coil. Is it a valid assumption that this was the same wire previously connected to the positive side of the coil?

3. the other black wire, which was previously connected to the negative side of the coil, and to a ground wire, connects to the black Pertonix wire?

[dm36415]

And that the negative side of the coil is only connected to a ground?

[haycait911]

#3, check, that black wire is probably your tach sender and is black with a purple stripe. if so it now connects to the black pertronix and the previos wire to the points.
#2, yes
#1, yes.
the terminal letters are marked on the black plastic on your cdi. good luck, Don.

[dm36415]

Thanks everybody, from all the guidance I've gotten it to run. Still needs connector cleanup and fine tuning, but it looks like a go.

Tapping the red Pertronix wire into a power supply (switched) is what was throwing me off, everything els was pretty much OK.

Additional guidance (below) from a previous thread helped also.

"I hooked the black wire from ignitor to the wire that was originally connected to my points. A simple connector change.
The red wire from the ignitor is connect to 12v that is controlled by the ignition switch.
The wire from the negative side of my coil is connected to ground. That is how it orignally was.
The wire on the positive side of my coil is still hooked in the original place."

[haycait911]

I hooked the black wire from ignitor to the wire that was originally connected to my points. A simple connector change.
The red wire from the ignitor is connect to 12v that is controlled by the ignition switch.
The wire from the negative side of my coil is connected to ground. That is how it orignally was.
The wire on the positive side of my coil is still hooked in the original place."

well THAT makes it sound EASY. I'm glad you're mobile, Don.

[dm36415]

Not quite so mobile, check my next post questioning distributor and timing