Most I have seen have a 30a inline fuse near the battery end. Also a fuse or resettable breaker on the jack. If it does not have a inline fuse, I would add one!
I would run a jumper from the battery as stated earlier to verify it works, then trace the wire back to the battery.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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