Your new install looks pretty good. The red wire with the 5 amp fuse is the power supply to the USE/STORE switch to operate the latching relay. There is also a ground wire to the switch but it is connected to the chassis elsewhere.
So basically the USE/STORE switch takes the + 12 VDC and applies it to the yellow and yellow/black wires in one direction momentarily to move the latching relay to one position, and then the opposite way to move it to the other position.
So to eliminate the possibility of a bad latching relay you could apply 12 VDC to the small terminals momentarily to verify it switches as required.
IF OK, then move to the switch and verify you have both the positive from the red wire and the 1 from the ground wire, then verify the switch works as required. The will require the use of a multimeter. Hopefully you have one and are well versed in using it?
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad
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