
ho4wziit Tom!
i don't usually refer to wiring diagrams; i go with basics, which would apply to any car, truck, rickshaw, submarine, helicoptor, etc.
if you don't have a VOM(volt-ohm-meter), you can buy one for $10.
if the wires are cut off, strip a small piece at the tip,separate them, and don't let them touch enything.
if you have a buddy, have him pull the headlight switch on. with the meter in 12volt scale, clip one to ground, touch each wire 'til you have 12v reading.
that one's your tail light.
turn headlight switch off; buddy presses brake. test the remaining wires.
the one with 12v is your brake light.
release brake; use turn signal.
the last wire should have intermittent 12v; that's your turn signal.
this works well, if the truck's been re-wired, with wrong colors.
hope this helps.
Myron