2003 GX470 with 180K miles. I've shopped around several forums and can not find the next best step to try and figure out why my alternator is charging up to 16.9 volts. The battery light came on and I drove my vehicle home hoping the alternator wouldn't die and leave me stranded. Once home, we see the alternator is producing up to 16.9 volts. So I buy a reman from Rock Auto and put it in. Battery light still on. Replace the battery, nothing changes. I have my old battery tested (was new in 2021) and its good and they take a return on the battery I just bought. So I buy another alternator thinking I was unlucky with the reman and the regulator was bad. New alternator has the same issue, although the alternator seemed to work fine for a week despite the battery light still on, and now its hitting about 16.7 volts intermittently again and battery light going on and off. All connections are fine, not corroded. Even jumped a wire from the alternator to the battery to make sure there wasn't a bad wire. Ground wires are solid. All the fuses appear fine.
There must be some kind of sensor telling my alternator to charge more. Any help is appreciated.
