If no junction box under the slide, then the connection will be in the very rear back corner of the trailer, coming in from the bottom you should be able to trace two Rome lines, one 14 gauge for fridge and one 12 gauge for the microwave. Wiring on my trailer runs along inside bottom of slide wall behind an easily removable carpet covered board. Wiring should have transitioned from normal Rome to flexible stranded wire there and back to Rome once inside the frame of the trailer.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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