Re: 6 or 12 v coil ???

Posted by Bob on July 31, 2007 at 21:40:52 from (69.178.229.154):

In Reply to: 6 or 12 v coil ??? posted by Kevin Mc on July 31, 2007 at 13:35:36:

Depending upon the tractor's serial number, the resistor is either on the ignition switch, or built into the wiring harness, as a length of nichrome resistance wire.

If the engine had stopped with the breaker points "open", it would be normal to have 12 Volts at the coil.

If you "jog" the engine over a bit, so the points close, and primary ignition current is flowing, about half of the battery voltage will be "dropped" across the resistance, and half across the coil's primary winding, giving you about 6 Volts at the igntion switch side of the coil.

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