I have a series C Comet, the battery is going flat even when switched off, I’ve taken a battery lead off and put an ameter in, with the switch off it is showing a discharge of 0.2 amps. If I pull the plug (single wire) that plugs in the back of the dynamo out, the ameter goes to 0.00. It is 6 volt + earth, Miller dynamo, I replaced the regulator years ago with a little black solid stat thing that people used to use, forget what it was called think it was 2 or 3 letters, K something? Any pointers would be much appreciated.