LED lights are polarity sensitive. It is safe to assume that the red wire is positive, and must be attached to the positive wire in the fixture (the wire that goes to the center contact of the bulb receptacle). By the same token, the white wire is negative, and must go to ground.
In a fixture like a taillight, the placement of the "bulb" with respect to the reflector and lens is somewhat critical, in order to form a proper beam pointing backward at the vehicle behind you. In a running light, it probably is not.
Bill
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