Quote:
Originally Posted by Custom/Ten
We'll that sounds pretty easy, what's the resister for?
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The factory wiring in all 1967 - 1972 GM trucks contains a 10Ω resistance wire in the cab harness that prevents the alternator exciter circuit from back-feeding the ignition.
That 10Ω resistance wire will work fine if you are converting to a 10SI or 12SI internally regulated alternator.
But the newer CS-series alternators require at least 35Ω if you're hooking the circuit up to the L terminal. So there are conversion adapters available that contain an extra resistor to make up the difference.
Also, a lot of 1973 & newer GM vehicles no longer have the 10Ω resistance wire in applications without an ammeter or voltmeter ... they just rely on the resistance of the "gen" / "charge" indicator bulb. So that's why you see a difference in some adapters being listed for vehicles with vs. without gauges.