Re: 12v 9N - no spark

Posted by John T on August 30, 2005 at 16:17:11 from (66.244.90.98):

In Reply to: 12v 9N - no spark posted by Bob N. on August 30, 2005 at 12:14:32:

Bob, on a 12 volt system you can use EITHER:

1) A full 12 volt rated coil with no ballast. A 12 volt coil has around 2.5 to 3.5 ohms in its primary as measured between its lil + and - terminals.

ORRRRRRRRRRRR

2) A 6 volt coil and ahead of it a series voltage dropping ballast resistor which reduces 12 volts down to 6. They are around 1.5 to 1.85 ohms at around 30 watts rated. A 6 volt coil has around 1.5 to 2 ohms primary resistance.

NOTE on some tractors theres a ballast by pass starting circuit which feeds full unballasted battery voltage (by pases ballast) to the coil ONLY while shes cranking. This helps in cold weather starting.

John T

Follow Ups:

• Re: 12v 9N - no spark Bob N. 05:26:56 08/31/05 (0)

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