do you have
a wiring diagram [like in the shop manual]? if you notice there's a line marked "front of dash panel" which orients the diagram front/back, left/right and the components and wires are positioned in the truck exactly as on the diagram .... for the signal wiring
see here there's a diagram on page 5, there should be 2 seperate wire circuits for park and turn that connect to a plug on the rad support from the harness and from the light socket
Bill