Painless Wiring Help - parking/turn signal/side markers

[Hardway]

I have a '72 C-10 SWB 2WD that I am installing a Painless Harness for. I have been reading through the threads on making the side makers blink with the turn signals and connecting all the brown wires together. However I am running in to several questions and need some help answering them. For starters, the harness wiring does not even match up to the stock configuration of my truck. Out of the harness I have 3 wires, side marker (brn/wht), parking light (brown), and turn signal (blue). On the truck I have 3 wires coming out of the rad. support connector (brn, purple, and blue) My side marker has 2 wires (brown and black) My question is, what goes where? I know I have to have a ground somewhere but where? Even in stock configuration I can not figure out where the purple wire from parking/turn signal light connects to. I have read through the instructions multiple times and does not mention anything about it. As always any help is greatly appreicated.

[ChevLoRay]

Get a test light, the kind with the pointed (sharp) end that lets you pierce the insulation. With the lights flashing, locate the wire that is feeding it. One of the wires to the side marker should be spliced into that wire. The other should be grounded for the light to work like you want it.

[Hardway]

I know I can do this to determine the feed wires but i dont need to, they are already labeled. I just need to know how to hook up the 3 wires from the front turn signals in to the harness. I essentially only have 2 wires for the turn signals, one for low side constant burn, the other for high side flashing. The purple wire is not a ground but I need to know what it goes to. Worse comes to worse I can trial and error it but I dont want to.

[cdowns]

fropnt turn signal bulb is a 2 element bulb so youd have 2hot wires and one ground wire//use ohm meter to determire hich is which