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Flashman's avatar
Flashman
Explorer II
Jun 11, 2021

Trailer brake warning on RAM

I have a 2017 3500 and I get a check trailer brake warning when hooked up to my 5th wheel. I put another truck on the trailer and got the same warning. So the problem is in the trailer.

How does the truck know that the connection is not good? I thought the wire from the truck was an out put voltage. The lights (brake turn signal) on the trailer work fine.
Tow Vehicles
  • Fisherman's avatar
    Fisherman
    Explorer
    Jun 12, 2021
    Krusty wrote:
    If you were to connect a test lamp to the brake circuit on your trucks 7-pin connector, you may notice a small quick flash every 30 seconds or so. That is your brake controller monitoring the circuit. It sends out a voltage and watches for a reference to ground on the circuit. If it doesn't see one, it knows the circuit is open and displays the warning message.


    Good info, thanks.
  • Flashman's avatar
    Flashman
    Explorer II
    Jun 15, 2021
    Fixed, I read the other thread on the subject and followed the advice and pinched the contact on the trailer cord that plugs into the truck and that fixed it. Nice to have it fixed I was in Mexico and had a long drive home.

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