My friend has an L2 that won't start at the key, it can be crossed at a solenoid and fires up good. Once it is running the gauges all work and it charges ok. The big question here is what is the grounding style of this combine? It should be negative ground right? The guy helping my friend swears it is positive ground to start it by the way the one battery is hooked up, should it be two batteries in series or what?