Originally Posted by TheDurk

Are you sure the green stuff was not always there? It's possible the A/C compressor is dying but not dead, and the fail is due to low voltage. A/C can't kill an alt.Low voltage can kill A/C, at least temporarily.

At 9.4V, there are no expectations for behavior except bad. The A/C clutch won't hold, relays may open, stuff just doesn't work. There is no intelligent signalling and load shedding going on.

Get yourself a healthy battery/charging system again, and then see what else is going on. First, charge and then load test the battery. Always rule out a bad battery first in these situations. You will save a lot of time and headache. THEN see what the alternator is putting out...although it does sound like it's a fail. Recognize that the factory Densos are close to bulletproof if not immersed or filled with mud, and wiring fails, especially around the plug, are common.

Troubleshoot this, don't guess. If it's really the alt...it's usually better to rebuild than buy a reman. A puppy dies every time someone turns in a factory Denso as core on a crap-o reman. If you need to get going, eat the core charge, then rebuild the Denso so it is ready when the crap-o reman fails. It won't be long.