I have had some funny issue lately that i would like to get an opinion on. I have a 316i 1997 manual.
Saturday, after a long drive, my battery indicator turned on at 9 PM. i passed by an autoshop and changed the battery, while returning home the battery light remained on.
I went on Sunday morning, tested the battery while the car was off, the voltage was 12.07 V. I turned on the car, the battery voltage is 13.7 V. I checked the battery light and was surprised that it has turned off.
I drove it all day on Sunday and Monday, everything was normal except that car idling while switching gear or when stuck in traffic was not stable, toggling between almost 0 and 1. Yesterday night where the light turned back on and the idling issue stopped. I checked the battery voltage while the car was ON and it was around 11.8 V.
Do you think this is an alternator issue and i should replace it ? or could it be something else.
Would appreciate any feedback