Forum Discussion

8e3k0's avatar
8e3k0
Explorer
Feb 11, 2018

Electrical Trailer Plug on Holiday Rambler Arista

Having trouble with the trailer plug on a Arista Holiday Rambler with the Ford Chassis. Looks like a factory plug that takes off separately to the 7 pin plug. This take off only has 3 wires, a red, gr...
Golden_HVAC's avatar
Golden_HVAC
Explorer
Feb 11, 2018
Normally yellow and green are turn signals, brown running lights, white ground. On the 7 wire, you will have three additional colors, one being +12 from the battery (hopefully only when engine is running) perhaps back up lights and electric brake power, of you have a electric brake controller in the RV.

Yes you fan buy a 7 pin to 4 pin adapter at most RV parts sellers and even many Wal Marts with RV parts section. Check Autozone.com and CampingWorld.com

Good luck!

Fred.

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,329 PostsLatest Activity: Oct 28, 2025