resistance wire

[khnaess]

Hello
I got a 1972 F250 with a 390 cid and a previous owner installed pertronix ignition on this truck. I am not very familiar with electronic but I am trying
to understand this system. I have read somewhere that the original resistance wire have to be removed when going pointless. So I checked the wire that goes from the torpedo wall and to the + side of the coil with a voltmeter, and it showed about 12v. So I guess the resistance wire must have been removed. I looked under the dash just out of curiosity but everything looked original under there. I couldnt see any new wires or any signs of a resistance wire. The black insulation was not opened as far as I could see.
So my question is: Do all cars have this resistance wire or is my truck an exception? Where is the accurate position of this wire? Is it near the ignition or near the torpedo wall?

[Ranchero50]

Check the coil voltage with the truck running. It should match the battery. Even that isn't a 100% guarantee. You can pull the ashtray out, cut the covering off the bundle and see if the little pink wire was still there. It's about 7 feet long.

[khnaess]

Thanks! I will check it out.