http://www.m-and-d.com/pdfs/Ingersoll/12.1.pdf Remove battery and take to auto parts store & have them load test battery, they will let you know if battery is good or bad. Hands on, inspect wiring harness as well as all switches, relays, fuses, connections tight or loose including ground cables & straps, look for bare wires, burn spots, including ignition switch, unplug one at a time if ok replug, inspect spark plug , air filter, fuel filter for replacement. If battery & everything electrical looks good & checks out ok, purchase an inexpensive multi-meter and troubleshoot electrical & fuel system. If battery is draining, you may possibly have a bad alternator located under flywheel, and or voltage regulator. Post all numbers from engine, example: model xxxxxx, type xxxx, trim or code xx. Adjust valves per engine specs., very important, as well as changing oil & filter.