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Old 04-14-2019, 06:05 PM   #1
Randy E
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Montana trailer connection

Hi everyone.
We have a 2017. 3791RD that we tow with a 2016 Chevy Dually diesel crew cab. Every time I tow, I get an occasional warning on my truck dash that says ‘Check trailer connection’. Then immediately I get ‘Trailer connected’. Each time it dings to get my attention. I can tell you the trailer lights never blink off. The rear camera never goes off the brakes work as well during the warning. I did notice it does it more in a low speed stop and go situation. During a traffic jam it went off 20 times. I’ve tried to find it. I even installed a new trailer 7 pin plug. I pull 2 other trailers and never have an issue.
This Montana has the Mor-ryde pin box that has plastic bushings and rubber shock absorbing blocks inside. Do you think this might be a grounding issue?
During stop and go driving the pinbox slides all over.

Has anyone else ever had this type of issue?
I was thinking of adding a ground jump wire from the truck to the pinbox just to see if that helped.

Thanks for your thoughts
Randy & Tracy
Hermitage Pa.
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Old 04-14-2019, 07:46 PM   #2
Vet4jdc
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I had this happen before and it was water in the 7 pin connector. Not the one to the trailer but where the connector ties to the harness under the truck. Check all your connections. It's acting like mine did from water.



Quote:
Originally Posted by Randy E View Post
Hi everyone.
We have a 2017. 3791RD that we tow with a 2016 Chevy Dually diesel crew cab. Every time I tow, I get an occasional warning on my truck dash that says ‘Check trailer connection’. Then immediately I get ‘Trailer connected’. Each time it dings to get my attention. I can tell you the trailer lights never blink off. The rear camera never goes off the brakes work as well during the warning. I did notice it does it more in a low speed stop and go situation. During a traffic jam it went off 20 times. I’ve tried to find it. I even installed a new trailer 7 pin plug. I pull 2 other trailers and never have an issue.
This Montana has the Mor-ryde pin box that has plastic bushings and rubber shock absorbing blocks inside. Do you think this might be a grounding issue?
During stop and go driving the pinbox slides all over.

Has anyone else ever had this type of issue?
I was thinking of adding a ground jump wire from the truck to the pinbox just to see if that helped.

Thanks for your thoughts
Randy & Tracy
Hermitage Pa.
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Old 04-14-2019, 08:16 PM   #3
Hunts900
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I have the same issue with the same truck. By the time I find a place to safely pull over it has solved itself. I think it has to do with the 7 pin connector in the truck bed flexing during turns and bumps....but who knows. It is so infrequent it’s more of an annoyance, so I haven’t fully investigated.
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Old 04-14-2019, 10:59 PM   #4
jetskier
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Try using contact cleaner on the 7-way connector and a small wire brush to clean the connections.
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Old 04-15-2019, 07:59 AM   #5
BB_TX
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Does anyone know exactly how the trailer connection sensor works? What is it actually sensing? There would have to be some type closed loop electrical circuit.
I can not find anything on the web that describes it. Lot of opinions, but nothing that I would consider really knowledgeable or official.
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Old 04-15-2019, 08:26 AM   #6
BuilderBob
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If I remember correctly it senses the resistances in the ground circuit.
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Old 04-15-2019, 08:45 AM   #7
RichardD
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I have had this problem with 2 different 5th wheels with my 2015 Chevy Dually Duromax crewcab. I was pretty sure that it was a truck problem but after months of dealer appointments and even a GM Engineering inspection it turned out to be a 5th wheel problem. On the first coach, an SOB, it was inside the brake drums. The clips that hold the magnet wires onto the brake shoes had come off allowing the wires to rub on the drum. Once the insulation had been rubbed off the wires, the bare wires would cause a short that the truck's trailer brake system would send a message to dash. The second 5th wheel was on a 2 month old Montana. A little different problem this time and it was easier to find. A brake shoe retainer came apart causing the brake magnet to be constantly rubbing on the drum. Not only did I get a message on my dash but I got a message in my rear view mirror. My wheel was smoking, I immediately pulled over, no fire but a very hot brake drum.
Both times I was lucky, never lost the brakes or a wheel, thanks to my truck telling me there was something wrong with my trailer brakes.

I hope this helps!
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Old 04-15-2019, 08:51 AM   #8
speedster100
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spray the connectors with WD 40, wire brush the male end as best you can and spray both the female end and male end again. Plug them together and take them apart a few times and you should be good. Every month or so spray them with WD40 again... They get slightly corroded sitting in the open air due to moisture.
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Old 04-15-2019, 09:03 AM   #9
jetskier
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WD-40 Specialist Electrical Contact Cleaner Spray - Electronic & Electrical Equipment Cleaner. 11 oz. (Pack of 1) - 300554-E https://smile.amazon.com/dp/B00AF0OF..._HTjTCbCSAP8VR

The sense is from the electric brake circuit. If you put one of those 7-way LED light circuit checkers in the truck connector, it will flash every few seconds even when the brakes aren't applied. Once it senses the resistance of the magnet or hydraulic controller, it knows it has a trailer plugged in. This doesn't apply to non-brake 4-way type trailers.

ONLINE LED STORE 7-Way Blade Trailer Wiring Tester [Nickel-Plated Copper Terminals] [Continuity Test] [Rugged Material] 7-Pin Trailer Light Wire Circuit Tester https://smile.amazon.com/dp/B07G8R3K..._8ZjTCb1MN7TB9
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Old 04-15-2019, 10:15 AM   #10
BB_TX
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Quote:
Originally Posted by jetskier View Post
.....
The sense is from the electric brake circuit. If you put one of those 7-way LED light circuit checkers in the truck connector, it will flash every few seconds even when the brakes aren't applied. Once it senses the resistance of the magnet or hydraulic controller, it knows it has a trailer plugged in. This doesn't apply to non-brake 4-way type trailers.
.......
My 2012 F350 does not respond like that. The LED on the 7 way tester for the brake circuit comes on when I press the brake, off when I release the brake, but the dash still shows "Trailer disconnected". No flashing on the tester or the dash. But when I connect to the trailer, it shows trailer connected.
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