STD to HD Tow Package
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STD to HD Tow Package
I am looking for assistance with the factory wiring that came with the tow package on my 04 Expedition. Talked to the dealer today and they say that I have a light/std. tow package, ie class III/IV hitch and 4 pin plug. There is a wire for an electric brake and connector under the dash for the brake controller connection. The dealer said that everything was connected as far as under the hood. What I need to know is how do I convert the 4 pin to 7 pin and where should I get 12v power from?
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From: redding, ca.
Go to the dealership and ask them for the harness with the trailer wiring. Mine cost $60.00. It comes with the seven pin and the four pin plugs in one mount. Put the relay in the fuse box and that should be all you need. I just did this on my 01 and it works perfectly. charges the battery and everything. the harness plugs in near the drivers side frame rail by the spare tire.
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From: redding, ca.
It is on an f150 Supercrew. It origionally had the four pin trailer plug. I bought Ford part number YL3Z-13A576-GB. Plug that in after removing the old harness and put a relay in the fuse box. Should be all you need. Mine added the electric trailer brake, charge wires, seven pin plug, and four pin plug next to it.
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I am not looking to make it a HD pkg but to convert the 4 pin to 7 pin plug so that I can connect a trailer with brakes and charging capabilities. I have found a adapter but I would much rather use a Ford wiring harness that I know is compatible.
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
how much does that trailer weigh? have you considered you will also have to install a aux tranny cooler. the factory tranny is not made to tow and was not made with a aux tranny cooler. it only has a intank coil cooler which does almost nothing. what are your rear gears?
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Trailer - 4200. No, have not considered it. I am not sure about the gears. It is more than likely whatever was standard. I was not looking for a tow vehicle when I bought it, just something to replace a totaled 99 Expedition from a drunk driving accident, no not us, another driver.
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From: Utah County, UT
Originally Posted by obxdivr
I am not looking to make it a HD pkg but to convert the 4 pin to 7 pin plug so that I can connect a trailer with brakes and charging capabilities. I have found a adapter but I would much rather use a Ford wiring harness that I know is compatible.
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