Adding a 7-Way Trailer Connector to a 2005 Ford Expedition with Factory 4-Way
Updated 03/23/2016 | Published 03/21/2016
Question:
DO YOU HAVE SOMETHING LIKE THE 118247 THAT WILL FIT THE 05 EXPEDITION WITH FACTORY 4 WIRE
asked by: Matt O
Expert Reply:
There isn't a harness similar to # 118247 that fits your 2005 Ford Expedition with 4-Way connector but I do have a solution that will allow you to add a 7-Way fairly easily and retain the use of the 4-Way as well.
You will need connector # 37185. The 4-Way you have will plug into this adapter. The white wire grounds to the vehicle frame. The other wires will connect to tow package wiring under the vehicle. Follow your 4-Way forward under the vehicle to where it connects to another harness. Pull back the covering around the wires going into this other harness.
There should be some additional wires there. The orange wire is 12 volt power and connects to the 37185 black wire. The blue wire is for electric brake output and connects to the blue wire on the 37185. That just leaves the purple wire which is for reverse lights. If the trailer does not have reverse lights then you don't have to connect this wire. If it does then splice the purple wire into one of the reverse light wires behind a tail light on your 2005 Ford Expedition. I have included a link to a help article with more information on this.
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