Possible Alternator issue
I was at mcdonalds waiting the car was in drive but i was holding the brake, the stereo was on but not playing music the only other part of that running was the little fan in the amp, I had my neon lights on which run off the cigarette lighters through a 3 way split, and the headlights were on. As I'm sitting there the car kinda made a shutting down sound, the idle kinda "broke" idk like a coughing sound and the battery guage dropped from 17 to 12 for like 5-10 seconds then gradually went back up.
I have a feeling this is my alternator telling me its giving up, this is similar to the issue I had when i would come home and put my car in reverse to go park in my garage and the guage would drop and i had to rev to get it back up again.
Any ideas? I'm considering getting a bigger alternator to handle my stereo better.