No power at either side of the switch - right?
Did you check your fuses with a meter or simply look at them?
Is there a slip on connector that goes to the fuse block that could be off, loose, corroded or needs re-crimping? (That's true at the switch end also.)
With the age of the unit, I'd suspect corroded connectors. My rig is 2008 and when I have trouble it's usually a connector. So, luckily, most of my wiring is labelled, and I can pull connectors, spray with CRC contact cleaner and lubricant, let air dry, then add some dielectric grease (to prevent future corrosion) and reassemble all the connections as I troubleshoot.
Sometimes I've had to make a "jumper" wire that I take directly from a good fuse and bring to the switch or connector that I suspect is not working... I touch the jumper to the connection to see if the device starts working...
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2008 Phaeton 36QSH, Safe-t-Plus, Quadra Bigfoot
2017 Jeep Cherokee Trailhawk w/ flat tow wiring mod.
Blue ox, BrakeMaster + BrakeAway, diode lights and charge.
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