charging warning light on?

[alexlula]

Hey guys , i just changed my battery to a brand new agm one, tge car starts and no more sudden idle drop when i turn on my headlights but my battery warning light still is on and i tried starting the car and unplugging the battery and it still runs without it, i need help my drive belt is tight on idle my charge is at 13.2 volts and when i give it a bit of gas the warning light dimmes any ideas?

92 mx-5
thanks

Alex

[Demon I Am]

Check that the alternator tension bolt has not fallen off. I've had that happen before.

[alexlula]

i will deff check that out tommorow but wouldnt my belt be loose ?

[horribleR]

charging numbers are supposed to be in the 14-ish range. according to internet peoples.

[MemphisMiata]

Definitely put a good quality Voltmeter/Multimeter on the battery to make sure the alternator is charging.