Relay wiring with Pertronix

yes , you have the right idea. that is how I have mine wired, make sure you fuse the battery side.
I have my electric choke using the same circuit.
I have not had any problem , I am using an MSD dizzy and hot box.

67 Marlin wrote: Have a Pertronix Ignitor I and Flamethrower coil setup that I'd like to provide 12V with a relay. Is this the way to go? Yellow coil wire to 85 instead of to the coil + 86 to ground 30 to battery side of the chassis-mounted starter solenoid 87 out to the coil + This way I don't mess with the resistance wire, the fuse panel, or even use the wire that goes to the starter (blue?) as the input for 85. Will this work?

I took a look at my coil and it is a Flamethrower I, part # 40011 and is 1.5 ohms resistance. My mistake on the name! As I said it worked fine with the Pertronix I. I had the 1.35 ohm resistance wire with the 1.5 ohm coil, for a total of 2.85 ohms. My understanding is that most stock systems of the day have around 3 ohms of resistance.  I have also used the same FT II coil with a set of Accel hd points and condenser with equal success. Unless you have something fairly hairy for an engine, you should be ok with what you have. Less resistance may effect point life.

Playing around with coils is a thought. I now have the old Group 19 set up, which uses a .75 ohm coil and a separate 1.5 ohm ballast resistor as well as the factory 1.35 ohm resistor wire. 3.6 ohms with the full resistance and 2.1 ohms with the ballast cut out. If my lack of ability with a multi tester is to be believed the voltage is 8.5v and 9.8v, respectively. I find it runs equally well either way, fwiw.

Hopefully some of that ramble is of value!

Chris

PS: What I did eventually about the resistance wire was to simply splice a separate wire into the harness, bypassing the resistance wire. I ran the wire inside the harness and re-wrapped it, leaving the end at the starter relay. That way I can use either.




Edited by ccowx - May/19/2018 at 3:17am