The fog light fuse on my Discovery 38' is in the main chassis panel in the bin located aft of the left rear tire.I would get out my Wire Tacker on this one. Electricians tool that can tell you where a wire goes to. Two part tool, one part hooks to wire at light or start point and sends low volt signal thru wire, other part is a sensor and picks up signal and makes noise when held near the wire you're looking for. You can hook sender to fog light bulb wire and search around various panels till you get a tone. Same way they do telephone wire locates when looking for buried lines. GB Industries Wire Tracker model # GET - 4110T. About the same size as a cell phone. Also connects to tv coax, telephone and wall plugs besides the alligator clip. I think I got mine at home depot or lowes for $35 but well worth trying to trace out endless wires in these vehicles. Can tell you if the wire is broken too because if theres no tone or signal at the fuse end theres a break. Could be your problem. Dont use mine alot but one of the best tools I have.
Good Luck
KC
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