I have a pre 2007 Myco trailer under my 35 lightning. Does anyone know where I can get a harness connector to adapt the 4-flat and 2-flat plugs from the trailer to the round rv plug on my 2016 f-250? Cant reverse with just the 4-flat connected so I made up a home made plug to go from the 2-flat to the reverse light post on my trucks rv plug so I can back up. Kind of a pita and would like to have the correct adapter. Cant seem to find anything either from myco or on line trailer parts stores. Someone on here must have been in this situation.

NAPA has them, if you're not able to reverse make sure when you switch it that you check the reverse lock out solenoid is operating correctly, they have been known to go bad.

I bought this several years ago and rewired the head end of my 2005 Myco.

http://www.championtrailers.com/7-pole-flat-8-ft-whip/

There should be a junction box on the trailer where you can wire the pigtail into vs. individual cutting and splicing; but it will work for either. Myco has their own junction box made for them, which you can buy from them as well (which I also replaced).

Thanks guys , if I cant get one from my local napa I will be rewiring back to the j-box.
BIll