Re: Balast Resistor

Posted by John T on June 30, 2006 at 17:06:25 from (66.244.90.5):

In Reply to: Balast Resistor posted by w6tractor on June 30, 2006 at 14:48:17:

On a 12 volt tractor the external Ballast Resistor is indeed required IFFFFFFFFFFF:

A) Its a 6 volt coil

B) If the coil is labeled "12 Volts for use with
an external Ballast Resistor"

NO EXTERNAL BALLAST IS REQUIRED IFFFFFFFFFFFFF

A) Its a true full 12 volt rated coil what some
call an Internally Ballasted Coil (such are
often labeled "12 Volts"

B) If the coil is labeled "12 Volts NO external Ballast required"

If the colil gets so hot you can barely lay you hand on it,,,,,its probably a 6 volt coil and needs a ballast PLUS the points burn up quickly.

If you measure the coils primary resistance between its lil + and - terminals, a 6 volt will be around 1.25 to 1.75 ohms while a 12 volt will be more like 2.5 to 3.5 ohms.

John T

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