What he said...So with the engine running and AUX 3 bare wire, power switch is on and you get no power?
If you are positive that Aux 1 and 2 are working (since the fronts turn on) and SPV has the harness, it should be plug and play. Try an AUX switch that is currently working for the reverse lights. You could also go to Aux 4,5,6 and see if anything changes either. It's highly doubtful that from the factory the connection is missing.
My best guess is you are looking at the wrong fuse. Which # are you checking?
edit: hope this helps...
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