Driver's side reverse light not working

[PbFut]

Use a multimeter and verify you have 12v at the socket. If you have power it's a simple ground issue at the socket or light housing. If no power, start tracing back. If the other side is lit, then you will not have far to trace. Both left and right use a common +12v wire from the switch. If other side is lit, the problem is between the intersection of the hot wire and the failed lamp. If you do not have a multimeter, spend 10 bucks at harbor freight. It will be one if the most useful 10 dollar tools you'll own.