I have a 95 Mazda protege. The battery went dead from leaving the lights on. We jumped it and everything was ok. Drove around, shut it off and it started again, no problem. The next day the car wouldn’t start. Had dash lights, and it clicked but this time there is a high pitched noise. It is not an engine noise. I jumped it, it started right up. Tested the alternator, its putting out 14 volts. I could not find the source of the noise. I checked that all doors were closed and that sort of thing. I shut car off to see what would happen, the tone of the noise changed but car hadn’t built up enough charge to re start.
Any clue to whats up?