Initially I didn"t run a ballast on the first coil. This was the way Dad always ran the tractor- 12v to a 6v coil. It would run warm but it would run. New 6v Napa coil didn"t work with 12v (John T, distributor passed all your trouble shooting tests, thanks by the way for all your input)
I had prevoiously updated his other M with a ballast, again 12v to a 6v coil. No problem.
Because I was stumped on this rebuild I decided to trouble shoot with the other working tractor. The 2nd new Napa 6v coil went directly from the box onto the working tractor. Again, this working tractor (M) has a 12v battery, external ballast and a 6v coil working great. Out goes the working 6v coil in goes the new 6v Napa coil (6 volts printed right on the side) no spark. Simply, old 6v coil works.......new Napa 6v coil doesn"t. Both ballasted externally.
So first coil didn"t fire on 12v second didn"t fire on 6v. I suppose nobody actually buys 6v batteries so the industry have modified the 6v components to operate on 12v industry standard?
Note: Also printed on the case of the new 6v coils is "no external resistor required" John T, would this be the same as saying "No external ballast required?" If this is the case the first Napa coil failed to fire on straight 12v current (distributor test passed power to pos term, switched power to neg.)
ANYWAY, I"m going to throw a 12v coil on it, yes, and chuck the external ballast,(I had that figured all along) I know now the condenser and points could care less about 6 or 12 volts.
Re. the Napa coils, at least the first was a nonop plus they probably are built different than the older 6v coils. In any event, I was relieved to have been able to return both as they were $43 +tax.
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