Adding 5-Way Harness to 2018 Toyota Highlander With 4-Flat

Question

Question:

Yes, I have two boat trailers. One has a 4 pin flat (no brakes) while the other has a 5 pin flat (with brakes). The 5 pin flat includes 12V when in reverse to disengage the trailer brake when pressure is put to the hitch ball. Backing up is the same as stopping with regard to force, thus the 12V override. The Highlander comes factory with a 4 pin flat which is fine for the one trailer without brakes. Right now I tow with a Sequoia which has a 7 pin round and I use the adapters 7 to 4 pin flat and 7 to 5 pin flat. The 7 is pre-wired to provide the 12V when in reverse on the correct pin of the 5 pin flat. I am thinking that one solution would be to remove the Toyota wiring and install your 22119. Otherwise i would need to splice into the reverse light to get the 12V but that is less than ideal circuit wise. AS well as still needing a 4 pin flat for the other trailer.

asked by: Steve A

0

Expert Reply:

I'm a bit confused by your question; the Highlander you are getting has just a 4-pin flat, is that correct? And you are looking to tow a trailer with a 5-flat?

expert reply by: Kyle S

0

Steve A.

10/1/2018

Yes, I have two boat trailers. One has a 4 pin flat (no brakes) while the other has a 5 pin flat (with brakes). The 5 pin flat includes 12V when in reverse to disengage the trailer brake when pressure is put to the hitch ball. Backing up is the same as stopping with regard to force, thus the 12V override. The Highlander comes factory with a 4 pin flat which is fine for the one trailer without brakes. Right now I tow with a Sequoia which has a 7 pin round and I use the adapters 7 to 4 pin flat and 7 to 5 pin flat. The 7 is pre-wired to provide the 12V when in reverse on the correct pin of the 5 pin flat. I am thinking that one solution would be to remove the Toyota wiring and install your 22119. Otherwise i would need to splice into the reverse light to get the 12V but that is less than ideal circuit wise. AS well as still needing a 4 pin flat for the other trailer.

Reply

Kyle S.

10/1/2018

Thanks for that info and I see what you are saying. You do not need a 7-way at all; the only thing you need to add to the 4-way on your Highlander is the 4 Pole to 5 Pole Trailer Wiring Adapter # 20036. This adapter simply splices into the reverse light wire on the Highlander which you can do with the quick splice that is included with the adapter. That will allow you to use one connector for both of your trailers. I have added a link to an install video of this part on a '15 Highlander as well as a link to a help article on trailer wiring that I highly recommend checking out.

Reply

Answer 1

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…

view full answer...

Answer 2

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…

view full answer...

Answer 3

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…

view full answer...

Answer 4

As far as wiring for the 2024 Toyota Grand Highlander, we do have the Curt #C59236 available which is more of a universal hardwire harness. Unfortunately there are not any plug-and-play options that have been confirmed to fit as of yet (October 4,…

view full answer...

Answer 5

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…

view full answer...

Answer 6

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors which we…

view full answer...

Answer 7

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

view full answer...

Answer 8

I have attached a picture below of the Curt Hitch item #C26VV installed on a 2024 Toyota Grand Highlander. I really like this hitch because the crosstube installs behind the rear bumper leaving only the 2" receiver exposed. The Curt Hitch item…

view full answer...

Answer 9

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.

view full answer...

Answer 10

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…

view full answer...

Answer 11

I do have a solution for your 2024 Kia Telluride that has the LED taillights that does allow it to have both a 4-way and 7-way plus install a brake controller but it is not with the #TK74CR which does not work for you based on the LED taillights.…

view full answer...

Answer 12

If you have a vehicle specific wiring harness for a brake controller then that would indicate that you have a factory tow package and subsequently would already have a 7-way at the back of your vehicle. The universal 7-way connector #ETBC7 is meant…

view full answer...