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Thanks to @FordTechOne who provided specific diagram I was able to find the right fuse. Fuse responsible for AUX 4 is marked as fuse F67Test for voltage at the fuse? Test
Fuse 80(upfitter 4)
Fuse 19(upfitter 5)
Fuse 62(upfitter 6)
The switch needs to be on to send the voltage through the fuse. If the switch is off, it wont trigger the relay.