Those are Scotch lock connectors that are dirty. It just connects the wires from the brake magnets to the wiring harness. The brake "magnets" are just encapsulated coils so they are not polarity specific.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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