Re: Alternator warm with ignition off 1967 C10
That cylinder below the regulator is a "condenser"- a capacitor, used to reduce radio noise from the voltage regulator switching. I'd suspect that you have a failed diode in the alternator, or that the voltage regulator is bad. One of our guys has much more knowledge than I do about troubleshooting electrical; he'll likely be around soon with more on how to check that out properly.
How did you test the alternator to verify that it is good? I hope you didn't just pull a cable off the battery to see if the truck continued to run.
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~Steven
'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper
Simi Valley, CA
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