Trailer brake warning on RAM

If the circuit to the trailer brakes is not complete, it will sense that and send the error message. If both trucks are giving the same result, lights work but brakes send a message, check to see that the break away cable and switch are working. Then do a continuity check of the trailer brake wires, from the 7 pin connector. Could be as simple as a broken off ground or power wire.

Consider cleaning your 7 pin connector. I decided to replace my OE connector and no problems since.

is it set to the proper setting in the menu...Electric brakes or EOH (Electric over Hydraulics)

I will sense an open circuit and a shorted circuit

Fisherman wrote:
If the circuit to the trailer brakes is not complete, it will sense that and send the error message. If both trucks are giving the same result, lights work but brakes send a message, check to see that the break away cable and switch are working. Then do a continuity check of the trailer brake wires, from the 7 pin connector. Could be as simple as a broken off ground or power wire.

X2

All exposed wires are good - its the buried ones that suck.

Put some dielectric grease on the 7-pin connection, start simple.

kellem wrote:
Put some dielectric grease on the 7-pin connection, start simple.

This worked for me as well.

Didn't use the grease but sprayed with cleaner. Remember a 2nd truck showed same problem.

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.