Fixed it. 
I touched both wires together, and there was light. 5 mintues later after kept plugging the 2 wires in different combos, I finally found the right one.  
Here's a pic.
backup light
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*1962 C10 swb fleetside, big window, custom cab 350/TH350 combo...Hot Rod
*1963 C10 lwb fleetside, small window 230/4 speed...Blvd Cruiser
*1931 Ford 5 window coupe (soon to be Hot Rod)... Father & Son project
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