If it's a Delco heavy duty model I have some factory tech bulletins on that system, I believe. Does the regulator have a big power transistor on the bottom of the aluminum heat sink? The mid-1960's White Freightliner I drove for a while had the same system, with a solid-state remote regulator.

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Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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