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Dupe post.

Haven't received the new alt yet, but I plan on upgrading the wires to lower gage. The pcb should handle the higher amperage....I hope. This Neihoff 4/28 200 amp alternator should drop in to the existing mount. I'll keep you guys posted.

I'll be installing a Niehoff 14/28V 200 amp alternator. I'm guessing that the additional amp draw to charge my 4 batts might be too much for a 60 amp alt. and the RD AC system.

For those considering AC installation in their M939s, be aware that the alternator will need to be upgraded to a 100 amp or >unit. I've suffered multiple electrical system faults due to alternator not liking the additional load. So far I've replaced the ABS ECU, the fail safe module, and the...

Hey over. During the ac installation process, did you allow the drier to sit uncapped for a long time? This would introduce excessive amounts of humidity into the system and reek havoc on the system. Your high side should not be above 300.