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I have the uplifter switches and have no idea where the hook up wires are for this all i found under dash on left side was about 10 skinny wires capped and not the right colors as book shows ???
If yours is the the newer Superduty the fuse box is on the pass side & the old location under the steering wheel is just an access panel. The upfitter wires are above the park brake release & you can remove that access panel for more room /Light.. See the below PDF for the pictures of the wires & their location...