Hi everyone. Trouble with alternators hoping you can help.
1964 GMC. Newer 250.
Pulled an old alternator with a bad diode. It was draining the battery when the truck wasn’t running. It was connected with only one wire to the battery.
New alternator fits up perfectly and wired properly as best I can tell. The heavy wire goes to the battery and the two wire plug in the alternator has one lead going to positive and the other going to the generator light.
Here’s the problem. It’s still bleeding off power. With the two conductor plug plugged into the alternator, it drains full voltage. With the two conductor plug unplugged, it drains about 3 V and then quickly drops down 2.4 or so on a meter.
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I’m stuck. I don’t know any other variables to fuss with for the alternator.
Haven’t run it. Charging up the battery.
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