Club 80-90 Forums

Trying to make inroads to the bus refit, I find that in my stock of good parts is a rear lighting harness that has a third leg (predictably cut off, of course) which must have been for the towbar socket.
It also has a slightly different arrangement for the foglight supply and a third, 3-wire plug at the junction box end, but I dont know what connects to it.
Can anyone advise on this?

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