I am trying to help a friend with at x1 that has a brand new battery. Old battery did the same thing. Would not hold a charge. I am going out today and see if the cable sparkes (to let me know if there is a drain or short). If no drain or short where do I look next. I have no manual for this one. Any common problems? I am guessing this is an early 90's sled (2 seater) unsure of motor size. Little to go on I will find more today. Will the serial number on these give me a year?