bing tracking image
Q & A Icon

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

Question:

I am looking to buy a 2018/19 Toyota Highlander. The factory hitch wiring provides a 4 pin flat access. I have two trailers that I tow, one with a 4 pin flat but one with a 5 pin flat. I will be trading my Sequoia which has a 7 pin round and I use the handy adapter converters depending on which trailer I am towing. I need the 12 V power when reversing the 5 pin flat to disengage the trailer brakes. Is there a sturdy conversion that can be made to change from a 4 pin flat to a 7 pin round socket? Thank you

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:
0
Kyle S

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.

0

Expert Reply:

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.

expert reply by:
0
Kyle S

Products Referenced in This Question


Product Page this Question was Asked From


Q & A Icon

Similar Expert Q&A Pages

See More Q&A Expert Answers >>