The wiring diagram for a 72 lists the following:
The brown wire is for tail lights (dim on dual filament), tag light and side marker lights, if you have them.
The yellow wire is for drivers side stop/turn (bright on dual filament)
The green wire is for passenger side stop/turn (bright on dual filament)
The light green wire is for back-up lights.
Good Luck!
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'56 F-100 (w/all GM stuff)
Lookin' for another parts chaser! 
'05 GMC crew cab
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