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Hello. Welcome to Just Answer. Please allow me to assist you. A problem in the switch is most likely not the issue. I would suspect corrosion at the bulb sockets to be more of the problem, or, if this vehicle has a harness fitted to tow a trailer, that is usually the most common problem. I assume that the fuse that is blowing is the 10 amp TAIL fuse. Is this correct? Please advise.
ALl of the running lights are on the same circuit, front and rear.
There is a connection behind the driver side inner panel in the rear hatch area. 5 green wires. I would locates this connection and disconnect it and then retest.