What you want to do is fairly easy but you need to find a local rebuilder. I was a rebuilder so the information I am going to give you is from first hand experience, no guessing.
The rotor in a 24 Volt alternator will be wound differently than a 12 V rotor and therefore needs to be done properly. It will have a different amperage draw. To go with that, you need a 24 V voltage regulator. There are many different regulators available through a rebuilder depending on the type of alternator you use. As one person said, a Delco 10SI or 12 SI alternator are a couple of the most versatile alternators available and parts are fairly cheap for these. As for the stator and rectifier, you have to choose the output you want(amps) and buy those parts accordingly. This is a fairly simple procedure and you only need to use one alternator. If you need more information, send me an email and I will try to help you out the best I can.
Cheers
BWilliams60, can you contact me when you have time please, have a question about alternators, read your reply regarding 12 to 24 volt conversion and have a current question. I am not sure how messaging works here, I just registered and don't seem to understand how to message you.
Thanks
Doug
Mods Note:
Please don't hijack other member's thread, now you have your own thread, this thread was split from the links below:
https://forum.allaboutcircuits.com/threads/convert-a-12v-alternator-to-24v.91258/
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