Mine were coiled up over by the top of the parking brake linkage and labeled trailer.
My trucks are both tow package though, not sure if they all came with the wires.
If you do find them beware, the wire colors don't just connect same Dodge color to same color on most controllers. All the same colors are on both under the dash and the controller.
Makes hook up a bit confusing.
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Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock