Need Help With Generator or Cut-Out Problem

[Malcolm Robertson]

I have two generators (one old & one newly rebuilt). I think the old one is burned up because Ammeter does not show anything on the charging side and only a small discharge when I honk the horn or turn on the lights. My questions is when I installed the new generator and hook-up the wires the Ammeter "pegs" at a complete discharge and stays there until I unhook the power, I really don't know what to look for and would appreciate your help and recommendations.