How to change the pig tail to the control module? wires are dry rotted

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https://eautorepair.net/Marketing/Default.asp

Daytime Running Lights (DRL) Control Module,
Disconnect the negative battery cable.
Remove the instrument panel lower cover.
Reach underneath the instrument panel and remove the bolts and the daytime running lamp module.
Disconnect the electrical connector.

Lamp Control Module
Disconnect the negative battery cable.
Remove the instrument panel low cover.
Remove the screws and the lamp control module.
Disconnect the electrical connector.

Daytime Running Lamps (DRL) Module (T61)
Below the driver side of the I/P, near the center console

Lamp Driver Module (Notchback)
In the left rear of the engine compartment, near the EBCM
Front of Vehicle/Engine Compartment Component Views
Component Connector End Views
Lamp Control Module (Export, Hatchback)
Behind the driver side of the I/P

Possibly the person that borrowed your trailer changed some of the wires. Old-type bulbs don't care about polarity, but LEDs do.

most aftermarket electric controllers have 4 leads, a hot 12volt, ground, a wire that goes to the trailer brakes, and another wire tied into the brake lights. There should be instructions included with your controller. I put one on my 96 dodge ram 2500 4x4.

was this a hack job?> cutting wires. (cutting harness wires?)
or did you use those nice install kits with the connector pig tails
that find the factory harness connector.
if you messed it up, only the FSM can save you now.
read the schematics.
see ZJ
here
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

no electrical tape allowed (heat shrink)
no wire nuts (horror to max on cars)
no cannibal splices. (the cut in to factor wires, nasty they are)
or it can be bad.

I would check your tail light fuse first then test the brown wire in the tail light harness where you origionally cut into it. With the lights on there should be around 12v on it. if not you may have pulled the wire too hard and broke it upstream. Test to see if there is 12v at the fuse ad if there is, your trouble should be in the wire between the fuse and the spot where you cut into it.

If you have a pig tail on it just find another ford with a 5.0 and cut it off, splice into the wires and wire the new pig tail up. USE ELECTRIC TAPE, this is just a easy way to do it or you can buy a new fitting and wire it up that way, this way is alot easier for someone not knowing what they are doing

Id say your pig tail to the trailor is having high resistance or a wire is cracked, Follow the pigtail under bumper, It plugs into main harness, Disconnect and look for damage or a dry white powder. If everything else works as you say? And your positive the vehical being toweds lighting works on another vehical? than the pig tail is bad, replace at any local parts store

try running your own earth wire to your pigs tail---WOW AMERICAN ,iam getting their