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Dear Mr Henderson
As far as I remember, because I produced for you the emission control harness, your car is a 280SL.
On all pagodas there is a GREEN/white line that goes from MAIN LIGHT SWITCH to IGNITION switch, and connects to port labeled “Pa” on both sides.
But….. your photo shows lines with “eyelet terminals” “o shape ring” which can not be connected on your ignition switch since your car should have the large round connector (with 8 pins) on the ignition tumbler switch end.
So my previous answer was for WHITE/green line, and not for GREEN /white.
My guess is, as your harness is a REPRODUCTION, which is what we can find today, the didn’t have the right color combination and used GREEN WHITE for circuits described as WHITE GREEN on the wiring diagram.
Therefore and because of the kind of terminals, I am more inclined to affirm that we are dealing with a SIDE MARKERS circuit.
Attached a wiring diagram for late 280SL. It does not show wire colors, but you can see oon main light switch that a line comes out of port 56, and goes to an aux fuse box (38) and from there a line goes for each of the front side markers, and a third line goes back to 12 pin interconnector to rear harness.
Best regards
Leonardo Peterssen
Www.wiredoktor.com