Leer topper installed
Have a 2017 F250 Platinum Diesel 4wd SuperCrew and the same leer cap...
the 3rd party 'Pigtail Y or T' that are out there DO NOT WORK CORRECTLY. They cause the computer to indicate 'trailer attached' (there's a SVE bulletin on that too). this causes the computer to log 'towing miles'; disable the blind-spot (modify it), disable side-collision radar, changes the backup camera view (no more radius lines when turning), and likely causes the computer to mess with the timing and related settings for 'towing' rather than 'highway' service (this is about a 6mpg difference on fuel for me or about 33% less when towing). Likely has other effects as well.
Just received this from Ford Body Builder Advisory Service (https://www.fleet.ford.com/truckbbas)
So, I am off to find the 'purple wire'.
There's also a SVE there for Ford's recommended way to splice, lengthen and fix wires in the bulletins, don't recall which it is, specifically: something like metal butt connectors, rosin based solder (never acid), double adhesive shrink tubing, and loom cover if needed...
this gets part of it: https://www.fleet.ford.com/truckbbas...rical_v1-0.pdf page 2 - #17 is useful and related as well. Page 3 deals with splicing, etc.
Hope this helps others. There isn't a 'magic' dongle to fix this one up... short sighted by ford for a <$10 hidden accessory that was good that's no longer there...
Edit:
Here's the images of the pigtail that 'does not work' on my 2017 F250:

Last edited by danefraz; Sep 21, 2017 at 04:26 PM. Reason: add pix
My adapter plugs between the ford wiring harness and the back of the 7 way and has a hot wire that had to be run all the way to the battery.
Roly
it was a basic 'extension' of a regular harness (16" or so), with 3 wires out: CHMSL, GND, PWR off of the trailer plugs. Not sure of the brand (haven't looked for the logo to cross it to something else, kind of over it since it didn't work correctly). Will find the brand so others here don't have the same issue (later today at lunch).
removed it, and all returned to normal...
EDIT: I put a couple pictures of my offending pigtail in my original post.
Last edited by danefraz; Sep 21, 2017 at 04:29 PM. Reason: more info
3. Can the topper be remove easily if needed?
What I'd like to do is setup 4 pulleys in the barn connected to to winch, drive in, connect the cables to the roof rack on the topper and, disconnect the topper from the truck and lift it off. There are times where a topper is great and there are time when you need to haul something that won't fit with the topper in place.
Thanks..
Ford Trucks for Ford Truck Enthusiasts
SO, with help from the FORD BBAS (body builder advisory service) in an email I sent them, they said the violet wire in the passenger kick panel for chmsl only. It is officially the after-market trailer brake wire. Since I have OEM trailer brakes, it's now an accessory CHMSL.
The BBAS site also has a host of useful bulletins (wiring diagrams, electrical info, etc.).
Here's what it looks like for me:
The violet wire behind passenger side kick panel (CB04 tag).

Orange and White pass-thru wire also in the passenger kick panel, near the firewall. Not a lot of extra here.

Pretty tight at this point, but this adhesive-shrink butt connector works well.

Pass-thru wire, found behind passenger fuse box on a loom in the engine compartment. maximizing every mm of wire where possible.

Loom at the rear (I ran constant power and the CHMSL wire, both 12g wire, thru 'flex-poly' wire loom). What's not shown is the 7/32" hole I drilled and tapped for 1/4" with the buttonhead bolt to ground the camper wiring (camper black wire).

This is the inline fuse (I used a 5A mini fuse) up in the engine compartment.

adhesive-shrink butt connector. this got a second coat of adhesive shrink tape for 'extra measure'.

This is trial run of the wiring on the firewall. Finish was slightly different to get to the battery on the passenger side (from the firewall, under the hard ducting from the air filter to the battery. Zip tied to a couple bits of loom in the same area.

Loom runs the length of the truck down the passenger side. Zipped tied to existing loom where possible, keeping it up on top of the frame area. It crosses the truck to the rear driver's tail light using zip ties to existing loom behind the spare / along the top of the trailer hitch...
Hope this helps someone.
materials I started with:
30ft of violet 12g tinned copper wire
30ft of red 12g tinned copper wire
12g inline mini-fuse; 5A mini fuse
half dozen 10-12g adhesive lined shrink tube butt connectors
half dozen pieces of 3/8" 3:1 adhesive lined shrink tube (used a 12" piece)
30ft of poly flex wiring loom (reminds me of chinese finger cuffs)
couple dozen 8" zip ties ('good ones')
Last edited by danefraz; Oct 1, 2017 at 11:13 AM. Reason: fixed images
No need to cut or splice any wires when putting on a Leer topper.
Roly










