About a week ago, I let my SVO converted MB SD sit for three days in a garage due to weather.....slick roads in Pennsylvania. It would not start. My mechanic who installed the greasecar.com kit came over and got it started after letting the battery charge from the jump for a few minutes.

I ran the car for about a half hour including idling and driving.

Sunday, I went to start the car and it wouldn't start again. When I turn the glow plugs on, I let them warm up, the electrical comes on, the locks open (vacuum) but nothing turns over at all. Like the battery is totally dead?

What could be wrong????