Have I done wrong? New alt with internal reg
I was having problems with my old alt draining voltage so I bought a new internal reg alt. The exact one recomeended in in the Frequently asked qurestion section. Wired it precisely as Frequently asked questions said except I didnt hook the black ground wire at the alt to anything. Alternator works fine and gauge show it is charging. However, the drain as shown on multimeter is 12.5 volts when engine is shut off.? disconnet red wire to terminal on back of alt ,where it is supposed to go, and drain drops to .25 volts. it is .25 volts. Have I done something wrong? truck is 69 C10 307
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