OK, next step- - - - -connect a small jumper wire from the F terminal of the generator to the generator housing with the engine running, being sure to get a good ground. If the generator is capable of charging, the voltage should increase without limit as the speed increases. If voltage does not rise, try disassembling the generator and inspecting the brushes. They should be long enough to contact the armature firmly and the commutator (the brass strips at the end of the armature) should be smooth and shiny. Clean it up with a piece of emery cloth and a shoeshine motion if necessary. Generator brushes aren't expensive or hard to install, and replacing them will cure a lot of charging problems. Good luck!
Jerry
