5thGenRams Forums

Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!

  • We have been battling an on and off issue with registration verification emails not being sent out with certain users. We have finally got the issue resolved so if you have tried registering for the site but have not received a verification email, just request another verification email when you log in and you should now receive it. If you still don't receive the verification email, send us an email at [email protected] and we will get it resolved for you. Thanks!


Sep 26, 2018
Reaction score
I wanted to use the trailer tow odometer when towing my boat. But it didn’t work because my trailer has a 4-pin connecter and surge brakes. So, I decided to trick my truck to make it think electric brakes are connected so I could use all of the features of having a 7-pin trailer hooked up while towing my boat.

I measured 3 different RV trailers with electro and hydro/electric brakes. The impedance was ~ 3-6 ohms. I found some 5.1ohm 1/4watt resisters (1/2 watt would be better) in my hobby stash and connected it to the electric brakes and ground pins of a seven pin connector. I also, added a vehicle side 4-pin connector to hook to the trailer when towing. I needed about a foot wire more for my trailer to comfortably hook to the trailer connector on the 2019, so I made a pigtail adapter.

Before connecting the adapter you should set up your trailer to “LIGHT ELECTRIC” and the GAIN to 0.0. DO NOT INCREASE THE GAIN. You may damage the resistor.

Now all the towing features work. The Trailer Tow odometer works, The Truck now states that electric brakes are connected and rear park sense is turned off automatically when put into reverse. See the pictures….
Forgive the crappy drawing, I don't have a good schematic program.

Use at your own risk. I will not be liable for any damage.


  • IMG_1720.jpeg
    155.3 KB · Views: 59
  • IMG_1718.jpeg
    173.5 KB · Views: 63
  • IMG_1717.jpeg
    157 KB · Views: 61
  • IMG_1716.jpeg
    156.1 KB · Views: 58
  • IMG_1715.jpeg
    138.8 KB · Views: 59
  • IMG_1714.jpeg
    145.4 KB · Views: 54
  • IMG_1713.jpeg
    106.6 KB · Views: 52
  • Trailer Tow Mod.pdf
    24.8 KB · Views: 6
Last edited:

Users who are viewing this thread