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Old April 15th, 2021, 06:45 AM
biscaynebirdie biscaynebirdie is offline
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Join Date: Jan 2021
Location: Santa Rosa, California
Truck: 1965 1000 Series with 250 engine and SM420 transmission
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Default Re: Alternator troubleshooting voltage drain

Sounds like Dano just needs to perform a good old test as follows, then share his results:

1. Record the battery voltage with the key turned off.
2. Record the battery voltage with the key turned on (engine not running).
3. Record the battery voltage with the engine at idle.
4. Let engine reach operating temperature. Record the battery voltage with the engine at around 1,500 RPM. The voltage should obviously increase a bit, to somewhere between 13.4-14.9 volts... 15.3 volts maximum. If it exceeds 15.3 volts, let off the throttle immediately.

This information will help all of us better determine what your problem is. In other words, it will help us help you!

AZKen, am I missing anything here?
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