I purchased midfifty parking lights .Has a black and red wire.which is tail light wire and which is stop/blinker.thanks

 

You said you bought "parking lights" and then asked which wire is tail lamp and which is stop/turn. Parking lights may have turns but not tail or brake. Which is it, did you buy park lights (front) or tail lights (rear) with stop/tail?

 

ground out the case and put 12v to each wire...then you'll know how to wire your lights.

 

I just got a set of those myself. I did exactly what moejr said. I put the housing on one battery post and the wire on the other. Brighter one is brake/turn.

Scott