The generator is good. Swap the wires at the ammeter terminals. There should be only one heavy gauge wire going from the ammeter to the battery cable connection at the starter, and all the other circuits such as the ignition switch, fuse block, headlight switch and regulator "BAT" terminal wire should attach to the other terminal. Some ammeters have one long stud made to accommodate several terminals.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!