Thanks for the good advice. I'll check the system over thoroughly. The generator is Delco and a newly reconditioned unit. The VR is also new. The belt is new. The wiring is all new and everything has been carefully grounded where required. I fitted ground wires back from each light and from the VR, so that everything runs directly back to the positive cable.
The tractor starts easily every time and the battery doesn't seem to have gone flat yet. I get 10amps showing on the ammeter with the lights off.
The C39 generator I referred to is fitted to my Farmall M, which runs a complete Lucas system. It works well, but it is a real nightmare to set up the regulator connections.
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