Different model but made in the same factory. In my coach the factory inverter output goes to a junction box just behind the inverter. Three circuits emerge from the junction box. One goes forward to the main TV, outside TV and the electronic equipment cabinet above the RV fridge. The second one goes to the bedroom TV and to the outside kitchen fridge. The third one powers duplex receptacles under the bed. Thor plant 750 does not usually put any wiring in the outside walls because of the aluminum tubing braces in the wall. Normally wiring comes out of the floor and into interior wall chase or in a drawer cabinet. Wiring for slides is usually unique to that slide and wired when the slide is built.
Your coach has a wiring harness unique to the 33X, made in the plant 750 wiring shop. All harnesses are plugged into a test board before they are moved to the floor, so you should to find the wire you need near the fridge, unless the circuit is wired incorrectly at the power panel by the workers on the factory floor.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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