Thanks again, dlc ! the A part number is much, much shorter than the B part #. the B one looks like intestines bc it has so many diff wires...If you have installed in on a F-150 before and all is good, then I will go w that, order and then post back if I need help. if I knew the total length of the harness, I could just work backwards from where the receptacle goes in to see where the 4-pin rectangular plug goes.@tstex
The parts guy at Tasca is sort of correct.... I believe the harness has 5 or 6 direct connect plugs on it... (see pic below)... I believe 2 connect on the right rear & 2 on the left rear near the tail connections on the harness... The others 1 or 2 connect to the truck harness on the frame (I believe one is power & the other is for the fuses & brake controller.... but don't hold me to that)
It is not a very long harness all connections should be at the rear of the truck... when you get the new one & lay it out it is pretty straight forward. I installed one on my brothers truck yrs back... so I'm going on memory...
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Finally, another challenge I am going to have is "rounding out the hole" in the bracket where the 7-4 pin receptacle goes. When my back end hit the ground/street, it made the round hole oblong. The round portion of the receptacle was also "oblonged" and made it impossibe to install the 7-pin adapter. I am going to have to "re-round" it out w a round rat-tail file or similar. Once it's good, I am going to tape-off the area and spray paint it black w 4-5 coats. That bracket is welded on there pretty good so I am not going to remove it unless it's imperative.....thanks again !