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Why does a coil blow?
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Posted by 550Doug on November 22, 2005 at 05:44:47 from (64.7.137.34):
A few months back, my generator gave out and burnt some wiring so I took the opportunity to change over to a one-wire alternator system with a 12 volt neg ground. At that time I rewired and I also put on a new coil, 12V with internal resistor, just like the old one. It"s been running just fine for 3 months, ammeter works and indicates charging at 1/4 throttle. So yesterday the new coil failed! WHY?? Do alternators periodically spike? It was a new AGCO coil and did the job just fine for 3 months. It would get warm, but I think that"s normal, but it was never hot.
So now I"m looking at putting on a Pertronix system and here is a quote from their instructions: "Six and eight cylinder engines require a minimum of 1.5 ohm resistance. Four cylinder engines require a minimum of 3.0 ohms of resistance." So I"m wondering, do internal resistors blow?, What is the function of these resistors? Why do 4 cyl need more resistance? Can I measure the coil output voltage on a regular voltmeter?
I appreciate your responses. Thanks PS the tractor is a 1961 Cockshutt 550.
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