Adding a 7-Way Trailer Connector to a 2017 Toyota Highlander Limited Platinum with 4-Way

Question

Question:

I already have the factory hitch and harness in place but would like to convert it to a 7 pole round connector. I will be pulling a T@B tear trailer without electric brakes. Which wires do I need to connect and which ones can I leave unattached? Do I still need any circuit breakers? Thanks for the help and information.

asked by: John R

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Expert Reply:

To add a 7-Way connector to your 2017 Toyota Highlander which already has a 4-Way installed you will just need a few parts. First for the 7-Way you can use # 37185. This will add the 7-Way and retain the 4-Way should you need it.

If your trailer does not require 12 volt power then the only wire you will need to connect, other than the 4-Way, is the white ground wire which will go to a clean, bare metal surface.

If the trailer does need 12 volt power then in addition to the 37185 you will also need about 20 to 25 feet of 12 gauge wire # 12-1-1, sold by the foot, and circuit breaker # PK54540. You will also need some ring terminals and wiring tools so if you do not have those items I recommend kit # HM51020. Ground the white wire as explained above and then you will use the 12-1-1 wire to attach to the black wire on 37185. Route the wire to the vehicle battery. You will need any leftover wire to go from the breaker to the positive battery terminal.

Attach a ring terminal to the end of the wire and secure it to the AUX post on the breaker. Using the leftover wire attach a ring terminal to one end and secure it to the BATT post on the breaker. The other end will then go to the positive battery terminal using another ring terminal.

I have included some links that will help. Please note that not all of the instructions in the links will apply to your installation.

expert reply by: Michael H

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Answer 1

If you already have the 4-Way wiring harness installed on your 2017 Toyota Highlander, than all you will need to do is install the Universal Installation Kit #ETBC7. If you do not already have a 4-Way at the rear of your Highlander, and if you have…

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Answer 2

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Answer 3

For your 2017 Toyota Highlander XLE Hybrid the hitch I recommend is the USA-made etrailer 2-inch model #e98844 because it is compatible with your hybrid and because it offers easier no-drill installation than some of the other options. It is also…

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Answer 4

The particular parts you need to install a fully-functioning 7-Way on your 2019 Toyota Highlander Hybrid will depend on what exactly it's already equipped with. Either way you will need to start by adding a 4-Way connector harness. If your…

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Answer 5

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 6

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 7

There is only one difference between the Curt Trailer Hitch Receiver #C13176 and etrailer Trailer Hitch Receiver #e98909 that fit your 2020 Chevrolet Colorado, which is the finish. The Curt trailer hitch has a glossy black finish while the etrailer…

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Answer 8

Yes, we do. To add a hitch to your 2024 Toyota Grand Highlander, I recommend the Curt Trailer Hitch item #C26VV. This hitch is custom fit and bolts to your Toyota with included hardware. This is a class III hitch with a 2" receiver. It has a…

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Answer 9

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 10

Class I and Class II hitches both have a 1-1/4 inch receiver opening. The difference is that a Class I hitch has a lower tongue weight rating, usually 200 pounds and a lower towing rating, usually 2,000 pounds. A Class II hitch usually has a tongue…

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Answer 11

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 12

To add a hitch to your 2024 Toyota RAV4, I recommend the etrailer item #e23ZR. This hitch is custom fit and bolts to your Toyota with included hardware. This is a class III hitch with a 2" receiver. It has a 4,000 lbs towing capacity, and a 600…

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Adding a 7-Way Trailer Connector to a 2017 Toyota Highlander Limited Platinum with 4-Way

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