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I recently had the pulley come off my original alternator, dropping the belt and losing all things important (like aircon & water pump). Not to worry, being only a few kms from home after a trip to Bunnings to buy steel for some solar mounting on my shed, I nursed it home with coolant temp sender reporting 118c due to the lack of coolant flow.
I ordered the OEX 150a upgrade unit from Patrolapart, waited about 3 days, then put it on. Interestingly, the OBD2 port is reporting 14.6-14.7v while my Victron battery sense is reporting 14.35-14.45v at the battery.
I haven't tried any huge loads, I'm just happy the car works again. I didn't bother with the included upgrade cable as it didn't look any fatter than the original, nonetheless one could simply piggyback it over the original cable if desired.