Posted by John T on August 07, 2016 at 15:21:44 from (50.102.95.43):
In Reply to: ballast resistor posted by jim buford on August 07, 2016 at 08:11:49:
Jim, you ask "there is a ballast resistor hooked to the alternator (not a generator). Why is it located there and how should that be wired?"
Iffffff when you say "hooked to the alternator" you mean its wired say between a 3 wire 10SI alternator (1 or R small terminal) and the ignition switch (IGN out) or coils small + input terminal ITS THERE SO THE ALTERNATOR RECEIVES INITIAL EXCITATION VOLTAGE PLUS TO PREVENT RUN ON SO THE TRACTOR DOESNT KEEP RUNNING WHEN THE IGNITION IS OFF. Those are typically small 5/10 or more ohms low power rated resistors NOT high power ignition ballast resistors.
If it just happens to be mounted there and actually wires in series between the ignition switches IGN output and the coils input (NOT wired to alternator) and is a power rated resistor (maybe 1 to 2 or so ohms) its a VOLTAGE DROPPING (12 to 6) IGNITION BALLAST RESISTOR in cases where a 12 volt tractor uses a 6 volt coil.
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