brake light ?
 

Can anyone give me a wiring diagram for the brake light tail /turn lights ?My 60 fleetside has a Hevy duty bumper that has brake lights bolted on it. I want to replace it. The original light works only as a tail/ turn signal light .
My question is I see only two wires ( one black, one white )going to the original light assembly,how can I add a stop light funtion to it? I have located the wire that feeds the after market stop lights, can I just tap it into one of the wires going to the original light ?
ANY help would be great. Thanks Sal