ive become good with the wiring aspects of the old hondas.after time the wiring and connecters need to be cleaned up.your case woudl be best to get a multimeter and check the alretnator, rectifier,regulator, and coils.most important to check the ground connections first.the green wires are ground. alternator is probably good they hold up well for alot of years.my guess is regulator or rectifier.