Back to the turn signals - have pulled the switch out and studied the wiring diagrams.
Black wire is horn and it's hot.
Purple and brown wires are Emerg flashers. Brown is hot.
White is back-up switch
That leave dark blue, light blue, yellow and green. I see from the wiring diagram that (similar to a boat trailer) green is right rear and yellow is left rear. I see from the diagram that light blue is left front and dark blue is right front. All 4 of those should be the output wires from the turn signal switch.
So what wire provides the switched hot for the turn signals when the ignition is on?
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI