I would bet on the switch if you are not getting any juice to the front. To know for sure you would have to test the switch on the output side which is easy to with a little lighted tester. Just clip it to the ground side of switch and touch the + (probably red on input side) find the input to see if tester lights then turn the switch on and test the output side.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L