I have an 8N converted to 12 V DC generator through changing the coil winding. It is wired as type B generator. I installed a new C0NF10505A voltage regulator . The generator charges for 2 or 3 minutes and then suddenly the amps go to zero. Checked voltage and did not increase with rpms. After tapping the VR, it starts charging again, with the same behaviour, after a few minutes, it drops to zero. Sometimes when I start the tractor it starts charging and the same happens again. Sometimes, the amps meter oscillates before it goes to zero. The generator runs motorized and all cables were checked for continuity and insulation. Ground wire was checked also. Is there any thing I can do to repair the VR?