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I'd start at your power plug on the rear of your truck. Check all functions there. If OK, then go to JBox under pin box and remove cover. Check all functions there as that will tell if your pigtail has an issue. Check ground there as well. All your fiver running lights get power from your truck, not the house batteries. House batteries do supply power to breakaway switch.
You did hook the new batteries up correctly and not reversed polarity? If so, you blew fuses in converter.
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