What kind and how fresh is the battery. In my experience Red Tops Optimas are the worst! When I had my GN it sat on time for 2 mos in the garage and it would fire right up. Run / drive it for a while to recharge park it, less than a week it wouldnt start. Trickle charge for a couple days, start / run it, the NEXT day, it was done wouldnt do anything. I had several Red Tops do this over a 2-3 year period