Wiring a 7-Way Trailer Connector and Brake Controller on a 1998 Ford Expedition

Question

Question:

I want to connect a 7 pin to my 98 Ford Expedition. I found the connector under the dash, next to the computer diagnostic port. Where underneath the rear of the vehicle would I find the connection for the 7 pin? Thanks

asked by: Eddie

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Expert Reply:

There are three different ways a brake controller is installed on your Expedition. If your vehicle has a factory 7-Way then all that is needed is a Universal Brake Control Wiring Adapter for Ford, item # 3035-P, or a Ford adapter for the specific brake controller you select (see link).

If you have a factory installed 4-Way connector then you will need the above-mentioned items and a Adapter 4 Pole to 7 Pole and 4 Pole, item # 37185, to install the brake controller on your vehicle. The extra wiring will be spliced in along the driver side frame rail on the front side of a square connector (see link) above the spare tire. You will need to use a circuit tester, item # PTW2993, to wire these wires to the correct circuits coming from the front of the vehicle.

If you do not have a factory installed 7 or 4-Way connector then you will need to use the brake controller wiring adapter along with a T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, item # 118344, and a Brake Controller 7 and 4 Way Installation Kit, item # ETBC7. We have detailed instructions for installation of this kit on our brake controller installation from scratch page (see link).

expert reply by: Robert G

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Answer 1

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Answer 2

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Answer 3

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 4

The first thing you will need for your 1999 D250 is a 4-way. The Curt T-Connector Vehicle Wiring Harness #C55317 plugs into the connection points behind your rear bumper and will allow you to power your trailer's signal lights. Once the 4-way is…

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Answer 5

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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Answer 6

The Curt Trailer Hitch Receiver #C14012 you looked at fits the cargo van and passenger wagon models of the 2020 Ford Transit T350. The extended high roof won't impact fitment so you will be able to use this hitch on your T350. This is a Class IV…

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Answer 7

First you will need to add the Curt Trailer Hitch Receiver #C78VV to your 2024 GMC Canyon. Do note this will replace a factory crossmember that is used since your Canyon did not come with the factory tow package. Next the Hopkins Multi-Tow 7-Way…

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Answer 8

The part #HM40975 is designed to fit the round 7-way connector that is found on several vehicles. To install it would require your vehicle to have this round connector. (see picture) If instead you needed a way to hardwire in a 7-way to a vehicle you…

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Answer 9

Great question Larry, so the current version of the Progressive Dynamics converter #PD4655V does support lithium batteries as-is. At one point it did not but since lithium batteries have become more popular Progressive Dynamics decided to make this…

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Answer 10

To replace a 4-Way/7-Way connector on your 2021 Ram ProMaster 1500 you need the Hopkins Socket Kit #HM40975. Otherwise, if you're needing to ADD 4-Way and 7-Way sockets then you need the following parts: - Curt T-Connector Vehicle Wiring Harness…

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Wiring a 7-Way Trailer Connector and Brake Controller on a 1998 Ford Expedition

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