I myself play guitar too. A Scheter Hellraiser with the battery operated EMG;s but I can’t agree more that modern music just has no talent anymore. I mean metal is the way to go if you want talent. The scales and movement across the fretboard isn’t like anything else out there. If i could suggest a band thats not really hardcore but heavy check out Black Label Society. In my opinion, Zakk Wylde is the best gutarist out still jamming away. He was in Ozzy and was the guitarist for the No More Tears album.
The one person mentioned a parasitic draw. Someone in one of my electrical classes had a similar issue and we disconnected the altenator and it went away. I think the issue was one of the diodes was shorted internally so since the altenator was always getting 12 volts to it because the line was hot at all times the shorted diode was allowing it to have a constant drain. Probably explains why the charging voltage was only 12.3 volts because the altenator wasn’t really working. I think if you did a a/c ripple test it would be way out of spec.