Jim Hi
I found my red wire goes to the overdrive unit the black wire that was lose went to the sender unit on the gearbox, from what I found out is that the sender (on top or at the back of gearbox) controls the reverse light mine was disconnected. Its black wire from sender to rear light seems to work on earthing circuit.
Im sure someone more experienced will have a better explanation ! hope this helps, I believe it then runs up the back of the engine bay assume to live feed.
Sorry if a bit vague.
See my post 1st jan 2020 re reversing light wiring I had a lot fo feed back and useful information
Paul
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