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Since the fronts work and the rears do not and the rears are Thor installed there could be another fuse panel with fuses or relays, the wiring could be bad our the bulbs could be bad. On either thing that is possible and that is a bad ground in the twilight wiring circuity but that falls under wiring.
That is all it can be one or a combination of the three. Breakout the multimeter and start crawling around. Since it is both sides that would indicate that the wiring needs to be checked first. If the rig is under warranty take it to the dealer and have them check it out.
Question, does your state require safety inspections and if so when was it done and who performed the inspection.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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