Battery dead after 3 days of sitting
3 Answers
You have a parasitic draw or drain. One of your electrical circuits is shorted and drawing amps from the battery. You or your mechaninc will need to test each electrical circuit of the vehicle to find the culprit. It could be a switch, a corroded wire, accessory, etc.
If you have a parasitic draw, the process of locating the affected circuit is not difficult, just long to explain here. There are dozens of videos on the net. All you need is a multi-meter. Just remember when you are testing, keep all the doors closed and use the under hood fuse box first. Also, if you vehicle is equipped with a proximity key, keep it away from the vehicle when testing.