Red battery light on at idle (3 Viewers)

[housedavid1956]

Can I assume my alternator is getting week?
Just noticed today that red battery light is coming on at at idle but goes out with just a touch of the accelerator petal. Also comes on when activating the AHC.
Thanks for any advice

 

[TahoeZ]

Check the battery and battery cables, then measure voltage at idle and whatever higher RPM is getting it to turn off. If the battery and cables are good, the alternator might just need brushes.