Posted by Janicholson on November 28, 2021 at 18:05:40 from (24.240.46.228):
In Reply to: JD 420 S 6v to 12v posted by crsutton81 on November 28, 2021 at 17:04:37:
Coils designed for 12v systems are just correctly wound with slightly smaller and 2X longer than the 6v coils. No resister is inside other than the copper wire. When external resistors are used on 12v, the resistor is on the outside, and the coil is designed/wound for 6v. The resistor chops the voltage about in half. A bypass circuit is used to put cranking voltage of about 10 volts directly to the coil making a temporary hot spark. When cranking stops, the voltage goes again to the resistor. lowering the voltage for continuous running. I like to see the amps going into the battery so when I do the alternator thing, I wire it to the load side of the alternator. Delta is correct, removing the old regulator is preferred, and rebundling or replacing wires is best. 10 gauge for the Alt wire. Jim
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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