George, the resistor you need is for the alternators excitation circuit and as Jim noted IS NOT the same as any ignition coil ballast...... From some GM literature I read once I highly recommend a current limiting safety resistor in the alternators excitation circuit versus no resistance at all and I use a 10 ohm..... While the power rating in watt isnt requited to be as big, if you buy like a 5 to 10 watt 10 ohm resistor they have bigger easier to wire leads n are more heavy n rugged then a smaller watts power rated unit.
The 10 ohms 5 or 10 watt resistior wires in series after the voltage source (ignition switch usually) and before the alternators lil No. 1 side excitation terminal.
An idiot light is probably even way more resistance then a 10 ohm current limiting safety resistor I use n the alternator still receives sufficient excitaion. I dont usually even use a diode since the 10 ohms usually prevents ignition run on which the diode can be used to prevent.
Ive seen em used with NO resistor or diode n they still worked fine but as a conservative I prefer at least somne degree of current limiting protection in the excitation circuit be it a 10 ohm or an idiot light or a diode which ahs a 0.6 voltage drop across it.
Get a 10 ohm 10 watt resistoir from Rat Shack is my advice.
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