Alternator AC DELCO or Mitsuboshi

I bought my alternator from RockAuto and the Mitsubishi one **IS** the OEM part

Mitsubishi made a heap of OEM parts for other brands. Including alternators for Mazda lol. Also various electronic modules too.

I always get AC Delco from RockAuto... never had one bad out of the box... Can't really speak to any other brands.

I\u2019ve had an ac delco alternator from rock auto in my Honda Fit for 7 years now.

I tossed in a Mitsubishi 200 amp P71 alternator into an '06 Town Car after the original 6G on it failed. Very good output even at low RPM

Put an AC Delco alternator on my Celica because I couldn't get a Denso for it. Wasn't going to buy a store brand reman that'll die in 6 months.

If it was me, I’d go with the ACDelco. Never had any issues with them so far. Checking for the best warranty is something else you might consider, just make sure to read that fine print closely.

On rock auto I see new alternators from ac delco. Not sure about any of those brands.

The issue you can run into is most common vehicle alternators are light duty at best. Lets say its a 100 amp alt, don't pull more than 40 amps continuous. A great example is the AC Delco 10si alternator. Loads of cheap knock offs and copies of that alternator all claiming crazy high amperage but none list the duty cycle. The 10si frame is designed for 40 amps of power and the heat that creates. You might be able to get a little more cooling with a better fan but you won't get 100+ amps out of one.

Another good way to tell your alternator is going is the battery light illumination. I noticed as I drove to higher RPM's, used the vents or even used windows with more power gave more illumination of the battery light. Tested the alternator at a shop and found it to be weak, battery was fine.