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Old 12-26-2003, 02:37 PM
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The GM 10 and 12 SI series alternators need 10 Ohm 10 Watts of resistance in the circuit (the 12V switched exciter circuit, not sure what the technical name for it is). Without this, they go to a full charge state (like 37 Volts or something). Cars with out an idiot light will have a resistor or length of resistor wire, and in cars with an idiot light, the light bulb istself is the resistor.

That is one of the tricks in converting to the CS series alternators, the amount of resistance is way different.
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