The Sidekick was having voltage problems one night, when I was stuck in traffic. I thought it was the switch that I installed on the ground cable, so I pulled it out and it ran fine after that. It was a cheap switch, that I had installed to keep my battery strong when I leave the Sidekick at the airport for several weeks. I didn't seem to have a problem after that, but it may have killed my alternator. The alternator had enough output to run during the day, but it struggled at night in traffic with headlights and my excessively large Spal fan. I really need to reolace that fan.
I checked voltage with the engine on and minimal accessories on. It was only putting out 13.5V. I was planning on upgrading the alternator for my winch install, so I ordered a replacement 160A alternator. I wanted to take the Sidekick deer hunting, so I put in the alternator from the totaled Sport, until the new one arrived.
The pic below is of the old alternator and the new one, side by side. There were minor differences, but it is working fine. I will test the max amps later, when it isn't raining. I had to hand file the bushing in the lower mount hole. The new alternator was 0.035" too wide and wouldn't slip into the lower bracket. Everything else went fine.