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I am trouble shooting an electrical problem in my TR4-A and have a question about part of the lighting circuit. There is a Green/Brown wire coming from the switched side of the fuse block going to the light switch. The diagram I am using (not sure if it is correct) shows that the wire perhaps goes thru a switch mechanism and then connects in with the switch wire for the headlights then on to the dimmer switch. I can't figure out the purpose of that wire. Everything else in the diagram seems to make sense (as much sense as the Prince of Darkness will allow) but I can't figure out the need for a switched hot wire in the light circuit when there is already a hot wire ('always on') coming off the ignition switch. In my car this wire has been burned/melted/corroded at the point it leaves the switch (probably shorted against the steering column) and I would like to know what it should fix when I get it repaired. Excerpt from wiring diagram below. Any help is much appreciated.
Glenn
Glenn