Had a scary ride home with no alternator and battery down to 6 volts from SA yesterday.

Did some tests today and only 0.15V coming from the rear cord. I thought mud might have ruined the alternator but after looking around I saw a spark and noticed the rear cable feeding the crank battery had worn and rubbed onto the metal A/C hose.

Using a multimeter whilst car on confirms only 0.15V coming out. I'll take the alternator out this weekend but what do I look for?

Is the alternator completely ruined, is their a fuse or something inside the alternator at all to replace?

Any help appreciated!!!!