1500 hours. left machine sit for a couple days and when i went back it was dead- nothing no lights no noises. i jump started it off my truck and when i disconnected the cables the machine died instantly. i jumped it again and let cables sit on for a couple minutes- when i disconnected them machine ran for a bit then turned off- did this again and was able to load truck, turn loader off and turn it back on. i wonder if it will be dead when i get there today. is this a bad alternator? how to check/test?