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 > Trailer brake warning on RAM

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Flashman

Tucson, Aizona, USA

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Posted: 06/10/21 06:31pm Link  |  Quote  |  Print  |  Notify Moderator

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.

Fisherman

Angus, Ontario, Canada

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Posted: 06/10/21 06:52pm Link  |  Quote  |  Print  |  Notify Moderator

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.

Lwiddis

Near DVNP, California

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Posted: 06/10/21 07:03pm Link  |  Quote  |  Print  |  Notify Moderator

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


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Learjet

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Posted: 06/10/21 07:15pm Link  |  Quote  |  Print  |  Notify Moderator

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


2017 Ram Big Horn, DRW Long Box, 4x4, Cummins, Aisin, 3.73
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eHoefler

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Posted: 06/11/21 05:44am Link  |  Quote  |  Print  |  Notify Moderator

I will sense an open circuit and a shorted circuit


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SweetLou

La Quinta, CA USA

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Posted: 06/11/21 07:35am Link  |  Quote  |  Print  |  Notify Moderator

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


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Flashman

Tucson, Aizona, USA

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Posted: 06/11/21 08:22am Link  |  Quote  |  Print  |  Notify Moderator

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

kellem

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Posted: 06/11/21 08:40am Link  |  Quote  |  Print  |  Notify Moderator

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

Thermoguy

Graham, WA

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Posted: 06/11/21 09:08am Link  |  Quote  |  Print  |  Notify Moderator

kellem wrote:

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


This worked for me as well.

Flashman

Tucson, Aizona, USA

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Posted: 06/11/21 09:48am Link  |  Quote  |  Print  |  Notify Moderator

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

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