06-06-2021, 09:37 AM
If the warning lamp bulb blew when the engine was revved, it sounds as if the cutout is not operating and the dynamo is trying to charge through the lamp. Make sure that the cutout is wired correctly. Take off the top cover and check that it contacts are closing when the engine is revved. If not, try pushing them together briefly to see whether, when they are closed, the ammeter shows a charge. This will establish whether the cutout is faulty. If you can, try another known good cutout.