Here is where Ford told me to go on using Aux Sw. to wire Ford Tow Lighting $125 wires:
Hi Jeff(Levittown Service mgr)
Attached is Ford instructions for Bronco Trailer Light (4 wire only) If electric brakes ( blue wire) almost same .
I am proposing the following modification that use the Pre Wired 1.5mm E white/ yellow wire that lays behind the passenger cargo side panel, near or on top of RR wheel well.( Glove box to cargo Wire E)
Instead of re running 12 ga AWG inside left side of SUV, connect to white/ yellow ( Point E on diagram attached). The 6 Amp rated black box can fit in that area. Ground white wire there also.
Then disassemble the two tail light access panels ( per instructions) however:
No need to remove battery terminal wires, reset computers, etc. It will be on switch not under power, until flipped up. Remove passenger cargo side wall , per instruction for driver side wall ( revered from instructions)
Then connect Red power to white/ yellow. ( Order of connecting left up to tech)
Then Green wire is T connect as instructed( right halogen), but red/ yellow wires may have to be extended if not enough wire reach, to driver side and T connected red/ yellow, as instructed.
The remaining four wire will be run from passenger cargo , under bumper, to the 4/7 receipitical already installed on bumper. Just have tech double check correct Y, W, B, G pin locations, before connecting. Heat shrink would be nice! T connector , but Ford does not come with plug/ play connectors, since it came from F 150 part bin! Test for proper voltage, as progress 6-7Amp@12v ( no "dash" error codes)
Test lights working properly, and close up tail light access covers and passenger cargo side panel.
If all goes well, the voltage and 6-7 amps at point E in diagram, once the switch wires are respectively connected in firewall, and behind glove box to point E in diagram.
I believe that will save a lot of shop time, since at point E of Auxillary switches has 1.5mm and should be good for 17 amp(16 AWG) acpcitity. That would be a voltage drop of say 50% ( 17/6-7).
One other advantage; the Aux. Switch can dis-connect power when not needed. Only question for FORD is if Wire E is 1.5mm copper and will it void warrantee. The power wire E is there why not use it, and not re- create the wheel!
Sounds simple, but I am no tech. Best to forward email to right factory field engineer, before installation quote.
vin#1FMDE5BH2Nxxxxxx2022 Bronco.
On February 3, 2023, at 6:02 PM, FRANCIS GOSS wrote:
Short version
Owners manual pg 454 or so say 1.5 mm or 16 gauge wire. If 10 Amp fused then 6 amp trailer lights modular draw should be ok Just want to make sure before I bring in. Ford part should work in right side cargo. Just add red and yellow to left tailight assembly . T connectors should work.( 3) . Four wire trailer light wired to 4/7 pin reciptical. Job done test amps at point E on purple Owners manual before wiring.(below)
On February 3, 2023, at 8:51 AM, Jeffrey Alvarado wrote:
Got it !(But no answers yet. use #2 (15A) or #3(10A)?)
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