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There won't be just one fuse...........each function in there has a separate fuse. What is not working?
Sorry for the delay in getting back to you..........but, glad you tracked them down! IF you have an issue AT the plug on the brake or turn signals, it can be the taillight converter which is a small black box tucked up under the hitch area. Those go bad frequently. Test that with a 12 VDC test light. Hopefully that will resolve this for you. Get back to me if you need more later as all follow ups are included in our fee.