Engine not running jumper batt terminal on voltage reg to a or arm on generator . Look for a spark momentarily touching . Do you have a bolt meter you can just put on battery to see what voltage charging system is doing.
I am sending it back to the person from the ebay store. He said that he would repair and ship for free. Case closed....I hope.
I am late seeing this but I had the same problem. Ran the generator ground wire directly to one of the screws that grounds the regulator base. Solved my problem.