those tester are made to say that its bad, trust i know and brandons right about the core charge..not a bad price replaceing it sounds ok too..more then likey its just old and wore out
On my Stealth if the fusible link in the fuse box was bad or not connected the alternator would NOT charge. It wouldn't be a shock if its set up similar on other cars.
2011 Mitsubishi Lancer GTS - DD mode
1991 Mitsubishi 3000GT - Many mods to come