Forum Discussion

7_3_psdman's avatar
7_3_psdman
Explorer
May 05, 2020

Brake Controller failure

I am having an intermittent problem with the braking system from my 2000 Ford truck to my 2009 fifth wheel.
The trailer pigtail has to be plugged in before the Pilot brand brake controller will show a red C otherwise it just shows a red dot.
While towing down the road the brake controller looks like it drops out and quits showing any connection and I lose the brakes and lights on the trailer.
The problem is that I don't know whether it is in the controller or the truck wiring or the trailer wiring.
I have a lot of time to find the problem right now if I knew where to start. I have a meter and a test light.
We hadn't towed the trailer for a few years until we took the last trip about 500 miles from home and I didn't know that I lost brakes until we took the exit off of the big highway. The campground was only a couple of miles off the highway and I noticed that the controller wasn't reading while the wife paid for the site.
Anybody know where to start looking at the problem?

15 Replies

  • jdc1's avatar
    jdc1
    Explorer II
    That problem is usually caused by the connection between the truck and trailer. The spring tension at the plug loses it's tension. I've had to use a screw driver and pry the inside of the connectors enough to get more contact. And, I now use small bungee cords to hold the connector (trailer side) tightly to the truck receptacle.
  • This won't solve your problem, but it helped me. Be sure all your connectors are clean and put some dielectric grease on them. This will help with the connection.
  • Thanks enblethen. Yes! It is working now but that could be because it is an intermittent problem. I didn't have a manual because the controller was in the truck when I bought it used. Thanks again!
  • Here is manual:Pilot brake controller manual
    There is a troubleshooting guide. Looks like you will need to check all the connections starting with power and ground to controller.
    Did you try the manual control lever? what happens?
  • When we got home I hooked a battery charger up to the 5th whl. battery and when I did I found out that I had a loose connection on the red battery cable.
    So after reading about another guy's problem I am wondering if the trailer battery cable failure could cause a problem because of needing power to the breakaway switch.
    Could that cause the towing- braking system to fail intermittently while going down the road?