If you'll follow the power cables from the battery you should find a dedicated 12 volt circuit breaker under the battery tray , for the power jack .
No wire from inside the trailer , straight from the battery.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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