MEP 831a No Voltage

I recently acquired a MEP 831a with 6.5 hours with a engine that would not start. after a few troubleshooting found it to be a compression issue. pulled motor out and found to be a cracked piston and replaced it with new piston and rings. engine is now running with no problems there. now here is the issue I am now facing it produces no power. do not know how long it was sitting prior to the engine issue I am assuming when they first started it up in 2002 and set it off to the side. unit is clean and appears to be kept out of the weather. any ideas on what I could do to test this further or is there some thing I am missing ie. breaker somewhere that is not visible.