I have a B2150DT with (I think) a 12.5 amp alternator. Is that right???!!! If I put more lights on, the alternator won't be able to keep up. Will another model's alternator fit my application?
Kubota offers a heavy duty alternator kit for your tractor, part number (through wholegoods) is B9322. Check with your local dealer... (believe it is a 40 amp unit)
You may also want to check with an alternator rebuilder locally to see if they can make your current unit provide higher output. I have done that with automotive alternators in the past with good success. It may be less $$ than a new one.