You did not say which model you own or year. Some with more knowledge could help but the first step of knowing which one you own.
I have read before that some have suggested that the pre-wired units do not have wiring with enough capacity to carry large loads.
To me, the whole point of the pre-wiring is to enclose it inside the trailer so you don't have to run wires down the side, take off something to hide them, drill holes in the roof, etc.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
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