Difference Between 4-Pole to 7-way Wiring Adapters 47180 and 37185

Updated 06/12/2020 | Published 08/06/2017

Question:

Hopkins shows a 47185 but no 37185 as referenced in your answer. etrailer does show part number 37185. they look to be the same piece.

asked by: Kenny C

Expert Reply:

Hopkins part # HM47180 is a 4-pole-to-7-way wiring adapter that is equivalent to the similar # 37185. The only real functional difference between them is that on part # 37185 the 4-pole trailer connector is located to the side of the 7-way, rather than under it as with # HM47180.

Both adapters plug in at an existing 4-pole vehicle connector and re-format those lighting signals to the 7-way configuration. The 7-way can be wired, if desired, to add new functions by using the included pigtail leads. The usual additional circuits carried on a 7-way that are not carried on a 4-pole are 12V auxiliary trailer power, trailer braking power and reverse lights.

The linked article shows you all types of trailer wiring formats.

expert reply by: Adam R

Samuel B.

6/8/2020

I'm planning to buy a Jayco Hummingbird travel trailer but my 2015 Honda Pilot EX-L is not equipped with a towing harness. Can you please advise me on what is the most appropriate towing harness that I need to purchase and install? Thank you.

Chris R.

6/11/2020

For your 2015 Honda Pilot the Tekonsha T-One Vehicle Harness # 118265 will work perfectly to provide you with a full functional 7-Way connector. It will be a simple plug-and-play installation using factory ports on the Pilot. If the Hummingbird is equipped with electric brakes you'll also need to add a brake controller. I specifically recommend the Curt Echo # C51180.

Samuel B.

6/12/2020

@ChrisR , thanks for being helpful Chris.