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That’s an ac output. Used for driving a tach. Disconnect the wire. If you have ac on your dc power to your radio that would cause noise. I would check all of the grounds at alternator, batteries and frame to cab. That’s behind the grill on the passenger side.
The alternators are still current use. The military is not rushing to get rid of the stuff. Parts are scarce but can be found. It is possible to order direct from Niehoff. Expensive and I believe you have to get gov permission to buy the stuff.
You can do a 24v alternator and use a 100a battery equalizer to run the 12v. Plenty of commercial vehicles do this. You cant just run a 24v alt and draw off 12v between the two batteries it causes battery issues over time.
An easier way would be to change over to a straight 24 volt alternator. Something in the 120-150a range. Use a 100a battery equalizer power converter for the 12v. Add in a battery disconnect like the newer A1 trucks have. Box under the spare tire is only there to protect against improper battery...
I find the regulator confuses people. The front terminal is 24v excite/regulation and the back terminal marked AC is actually an AC output. Can be used to drive a tach and some other stuff. No idea what it's connected to on the first gen trucks.
I have found the alternators to be very reliable. Most of the time its the truck wiring and you loose the 24v to the regulator, which is used to excite it. No 24v to excite the alt will just spin and make no power.
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