I am working with a company called Electromaax to try and source a serpentine belt kit for the Universal M-25 & M-25 XPB diesel's. Electromaax builds high quality heavy duty alternators, wind gens and water makers and also has serpentine kits for many engines, but as of yet, not the M-25 or M-25 XPB.
This kit would drastically limit belt dusting and allow significantly larger alts for those with banks that can take the current, like AGM or GEL battery owners.
As many of you M-25 owners know the factory belt is really limited to 80-85 +/- amps due to the belt size and with a serpentine kit an alt of 160 amps or more is possible. If you have AGM's or a large bank of wets this means a LOT less engine run time to replenish the Ah's used. Even a bank of four flooded T-105's can take more current than you can produce with the stock belt on an M-25.
Electromaax is willing to manufacture this kit, though they are not completely in-expensive, but they are looking for feedback as to who might want one before spending the time to design them and manufacture them..
If you have interest in a serpentine kit for an M-25 please email John at: