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Since the ammeter shows zero or slight discharge and the car starts it confirms the problem is the generator, cutout or the generator wire to the ammeter may also be the generator ground through it's mounting brackets. If you have a jumper wire you can connect from a good ground to the generator body if it starts to charge the generator grounding is the problem. If not remove the jumper from generator and ground then jumper the cutout while engine is running, if it starts to charge the cut out is bad remove the jumper and then turn off the engine.