I recently had a much larger alternator
installed with new brackets. AltMount.com - Welcome - Mount a second alternator to your Yanmar 4JH4 marine engine
supplied a very high quality bracket that was a perfect bolt-on to my Yanmar
4JH4. I would post photos, but the ones on their website are better than what I could take given the limited space in my engine
area. The kit has a 10 rib
serpentine belt and a turnbuckle to adjust tension.
I went with a Leece Neville 140amp @ 24v alternator
from Starters, Alternators, DC Motors, Commercial Truck Parts Distributors - Your Starting & Charging Specialists Elreg Distributors Ltd.
. After many individuals on this forum pointed out that Balmar
does not make alternators but merely rebrands them, I found the identical one at elreg.com for about 1/4 the list price
of the Balmar
Both companies were easy to deal with, and everything was exactly as represented.
I have no connection with either company, but highly recommend them if you are in the market for a new alternator.