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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?
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.