760 wiring for trailer hitch ,thanks

I need some quick help I am installing a trailer hitch wiring on a 1990 760 trb sedan ..I have all the proper wiring harness' and battery wire with fuse not a problem. I need to know for sure what colored wire is what??
R turn ,L turn and the instruction say “tail” and of course ground. In the car ......

right side lights have wires of the colors…

2 purp/wh , 4 n/a, 6 thick blk , 8 rd/yl 1 yl/wh, 3 blk/gry 5 blue/gr 7 yl/wh
Best guess 5 blue /green

on the left side wire colores are
2 r/y , 4na, 6 thick blk , 8 purp/wh , 1 r/w, 3 green, 5blk/gry ,7 r/w
Best guess 3 green

. When they say “tail” do they mean parking lights that are always on with headlights or break light . So the break lights on trailer work many thanks in advance .William

[Peter Milnes]

Tail lights are the rear part of side and tail combo, in other words parking lights. Generally all bulbs (one front and two rear on each side) are 5 Watt rating.

Ground is Earth or the metal bodywork of the car. Usually Black is the colour for this and goes to an earth point. Left turn is Green, Right turn is Blue/Green, rear fogs are Violet(Purple)/White (both sides), Brake lights are both Yellow/Red, but you need to take the supply (one wire only) from the other side of the rear bulb failure warning unit (grey box on side wall of left rear wing) which is the Yellow wire coming into the unit. The rear tails are similar in that they also have to be fed from the other side of the same unit. Left tail feed is the White wire coming into the unit and right tail feed is the Green wire coming into the unit. Doing this avoids making the bulb failure indicator lamp illuminate when the caravan or trailer is connected.

All the best, Peter