Yes, that is exactly what they told me and also what they put in their literature. Standard Pertronix cannot be compared to a Pertronix II or a Pertronix III. Yet - I keep seeing posts just stating "Pertronix" with no hint as to what specific version. Ohm load on the Pertronix is critical.
I suspect most Pertronix modules use on old farm tractors are the standard versions (version 1 but but just called PERTRONIX). It works fine with copper wires but MUST have at least 3 ohms on the primary unless it has an 8 cylinder engine. I fixed an IH last year that burned up two modules and the guy had a 1.2 ohm coil. Yet he blamed Pertronix? I just put one on my Ford 641 and the original coil is 1.4 ohms and the ballast resistor is 1.8 ohms. So, a total of 3.2 ohms which is fine. If I took out the resistor, I would likely burn up the module.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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