mikeringland Posted March 5, 2017 Share Posted March 5, 2017 I bought the Pertronix ignition points conversion kit for my '72 Monte. The directions show a different way to wire the positive to the coil if the car is equipped with a ballast resistor. Does the '72 have one and what does it look like? Mike Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted March 5, 2017 Share Posted March 5, 2017 No I belive only mopar had them, but you do have to run a new hot wire to coil, not a resistor wire. You need 12 volts to the coil with that set up or close to it. I only have 11.5 for some reason but works fine. Quote Link to comment Share on other sites More sharing options...
mikeringland Posted March 5, 2017 Author Share Posted March 5, 2017 Why do I need to run a new hot wire to the coil? What is wrong with the wiring that is present on the positive lead? Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted March 5, 2017 Share Posted March 5, 2017 the factory wire to the coil IS! a wire with a specific resistance built into the wire Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted March 6, 2017 Share Posted March 6, 2017 I belive the factory voltage is about 6 volts, the pertronix requires 12. Read and follow the instructions there tech line is prety helpful also. I did contact them when I did mine. It is a pretty straight forward instlation. Quote Link to comment Share on other sites More sharing options...
Mo's70MCs Posted March 6, 2017 Share Posted March 6, 2017 Why do I need to run a new hot wire to the coil? What is wrong with the wiring that is present on the positive lead? Your 72' came with standard ignition (points) so in order to supply the coil its proper voltage GM decided to use a ballast wire. The wire contained in the primary ignition circuit designed to reduce wear on ignition components. Most coils of the time required an external ballast wire or resistor. With regards to your new install it may require full voltage to the system, instead of the voltage drop in your current system. Make sense? Quote Link to comment Share on other sites More sharing options...
mikeringland Posted March 6, 2017 Author Share Posted March 6, 2017 Yes, it makes sense. I was not aware that the positive lead was only operating at 6.5 volts. This is why I enjoy this forum, I am able to get clear answers to questions about this car. Thank you, Mike 1 Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted March 6, 2017 Share Posted March 6, 2017 NOW!!!!! if you replace it....make sure you wire it to an ignition circuit NOT! an accessory circuit otherwise it will not get power while cranking the starter Quote Link to comment Share on other sites More sharing options...
mikeringland Posted March 7, 2017 Author Share Posted March 7, 2017 Haha, ok got it. What's a good circuit to jump off of to achieve this? Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted March 8, 2017 Share Posted March 8, 2017 I no longer use the carburetor seloniod as I've changed the carb so I used that wire and works fine. Quote Link to comment Share on other sites More sharing options...
mikeringland Posted March 22, 2017 Author Share Posted March 22, 2017 Ok so I ran a new ignition wire from my fusebox to the positive lead of the coil. I removed the 2 wires that were crimped under one fork connector. My guess is one was the 12 volts ignition power and the other was the resistor wire. Does that sound right? Also, there is a 3rd wire that comes off the positive lead and goes to a small cylinder that is in top of the intake manifold behind the distributor. What is that, and should I leave it connected now that I have 12 volts at that lead rather than 6.5 volts when the car is running? Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted March 22, 2017 Share Posted March 22, 2017 Not sure what your refering to but did it have 12 volts originally? If it only had 6.5 and has 12 now it may cause some damage I assume. I think in the instructions it says to change the wire from ignition switch to coil but as long as you have 12 volts with key on and 0 with key off you should be good. Its scarg doing something new for sure but im sure your fine. Quote Link to comment Share on other sites More sharing options...
mikeringland Posted March 23, 2017 Author Share Posted March 23, 2017 I think I figured out what it is. I think it's the oil pressure sending unit. My Monte only has an idiot light for the oil pressure, and it still works so I guess I have nothing to worry about. 1 Quote Link to comment Share on other sites More sharing options...
cny first gen 71 Posted March 23, 2017 Share Posted March 23, 2017 Did you get it running yet? Quote Link to comment Share on other sites More sharing options...
mikeringland Posted March 23, 2017 Author Share Posted March 23, 2017 Yeah I have it running, it's all ready to go if the weather would cooperate. Quote Link to comment Share on other sites More sharing options...
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