It has to be a simple trouble.
Remove the couple of screws holding the fixture up and verify the switch, voltage 12 vdc and ground connections. Even the bulb can be bad in a new unit. Mine is a lot older but when we first got the rig, I had my dealer order a fixture to match others and we have been very happy with it. It was not defective but kept loosening up and falling apart.
Good luck finding it!
2011- 351RLTS Eagle, MorRyde suspension/pin box,
2017- F350 6.7 PSD Lariat FX4,SRW, SB,CC
Hughes PWD SP-50A, TST TPMS
Gator roll-up bed cover
B&W Turnover ball, Andersen Ultimate 3220
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