i guess i am of the thinking that it would take less than 15 minutes to splice in a new pigtail...hook up to tow vehicle...and figure out what really works/doesn't. in fact...i wouldn't even finalize the splice...connect wires by twisting...check all lights...make determination and after you fix what you need...go back to pigtail and make permenent repair with quality heat shrink butt connectors and silicone. for trailer applications...i use wurth brand heat shrink butt connectors...a bit of silicone and overlay that with a longer (maybe 4") piece of heat shrink over that...
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