Ok so last Saturday my son goes to start his car. Battery dead. I jumped it and it was fine until Tuesday/Wed. Then the battery died again. Nothing was left on that we could see. We got the car back in mid September from Anthonys Dad. It's been a great car for him too.
We took the battery yesterday to Interstate where we got the battery and there were ZERO cranking volts. Funny though, it started perfectly fine 8 hours before this. I took off the alternator to Autozone (that place sucks ass btw) and it tested fine. While the car is running it's getting 14.5 volts so it's not over charging.
Spoke to Sigman and he suggested to get a test light and put it between the battery and the terminal. Did that and pulled every fuse we could fine. Light is still on. Also unplugged the alternator plug to see if that was it. Nope.
The voltage on his gauge in the car is reading 17 (almost at the red part of 18 but not quite there yet). A few weeks ago it was normal in the middle around 14-15 volts.
I did tighten up a ground that seemed to be loose. Not sure what else to check.
I hate electrical problems. If anyone has any other ideas I can try that would be great. It's odd though. The day after I jumped it, it ran fine for 3-4 days and then no issue. Then crapped out again. My son swears he doesn't leave anything on in the car. Lights, etc.
It does have an aftermarket alarm though that I'm debating in the culprit.
Any ideas?