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Old 09-22-2015, 05:18 PM   #1
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'15 Ram trailer brake issue

Hey all. I figured I'd post this on here for those of you with 2015 Ram HD models.

Basically, some of use are having trouble get full power out of our trailer brakes. A pair of posters at http://www.ramforum.com/f119/brake_controller-71708/ ended up getting pushed into intersections by their trailers.

My tale is simpler. In August I borrowed my father's toy hauler. We hooked up and we're setting the gain on the brakes. He tows with a 2012 Ram 3500 and sets his gain to about 3.5. That was my starting point as well. Ended up at 6.5. He thought something was fishy because at 3.5 his grabs hard where at 6.5 mine was moderate. I just attributed this to my ITBM being set to light electric and his most have been on heavy.

So away I went. I didn't think much else of it... until I had my own trailer and was facing 10 miles of 5-8% downhill grade. I stop at the brake check area and set it to heavy electric 6, slide the bar over and give it some gas and I'm pulling the trailer without sliding the wheels. Cranked it up to 7.5 and they still didn't provide near enough resistance. Fortunately I'm a granny and just took it easy down the grade and didn't need them much.

I get back and start researching and find that other owners are having issues with their trailer brakes too. They work, just not real well. A few have been in to the dealer. Most run a quick diagnostic and say it's working as it should. One replaced the ITBM with no success. I got out my multimeter and checked voltages. On light electric on gain 10 and slider all the way over I was getting 8.3v at the 7pin. Heavy electric only 7.4v! I posted this and others had very similar results. This should be close to 12.5v!!!

Somebody found a thread on an airstream site with a 2015 Ram owner having the same issue. Dealer runs diagnostic and says it's ok. Customer insisted it is not, so they replaced the ITBM from a 2015 on the lot. Like the other guy, this did nothing to help. Dealer insists his trailer brakes are not set up properly so he calls the Airstream dealer and they have him bring in his truck. They too find around 8v at the pin. In minutes they isolated the problem to a connector from the wiring to the 7pin. A contact inside the connector was not making good contact. 5 min with a pick and some dielectric grease and he had over 11v and his trailer brakes work great now!!

IF you have 2015 Ram 2500 or 3500 check to see if you can lock up the trailer brakes with the slider at 20mph or so. If not, you likely have the same issue we are fighting.
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Old 09-22-2015, 05:21 PM   #2
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Good post!
Pics of offending

Connector would be great!

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Old 09-22-2015, 05:26 PM   #3
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I need to find it and see if that is my problem, but I highly suspect it is!
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Old 09-22-2015, 07:39 PM   #4
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I know when chevy started using the built in brake controllers they where total junk. If I had kept the truck I was going to unhook it and install a aftermarket one. Which I think are a lot better to set it where you want it. Good luck on finding your problem.
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Old 09-22-2015, 07:47 PM   #5
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Quote:
Originally Posted by Big Red and 30WR View Post
I know when chevy started using the built in brake controllers they where total junk. If I had kept the truck I was going to unhook it and install a aftermarket one. Which I think are a lot better to set it where you want it. Good luck on finding your problem.
You may think they are junk but mine has worked flawlessly on several Chevys I've had. Remember when going down grade to use tow haul mode to make it be in the most effective mode. Later RJD
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Old 09-22-2015, 07:54 PM   #6
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Did you try and ask for help at Turbo Diesel Register. Com. This is a fee site that is totally devoted to the Ram trucks with the Cummins engine, there are a couple of Ram tec 's on the site and could offer you a suggest on the Ram brake contoller.

That is the only site I trust for information on my Ram truck, been a member since Nov 2007, when I purchased my new 2008 Ram truck.
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Old 09-23-2015, 11:08 AM   #7
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One of the forums we have been gleaning for info looking to find a solution has been a cummins forum. Alone with 2 Ram forums, an airstream forum, and now here. In all the previous there has been at least one or more members with the same problem and it only seems to affect the 2015 HD Ram models.

It is important to know, if you have this issue you may not know it! Your trailer brakes work, but only at about 70%. That may not seem like much until you wish you had that extra 30%. Ram will run diagnostics and never check voltages and say it is working as designed. Somebody on the link I provided posted pictures of the diagnostic steps from Ram. They never check voltage at the 7pin connector and compare it to the at the ITBM.
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Old 09-23-2015, 01:25 PM   #8
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I am having the same problem
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Old 09-23-2015, 01:27 PM   #9
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What connector ???
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Old 09-23-2015, 01:48 PM   #10
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if the connector is reading low voltage without any current going through it(so it is making a very bad contact) then when you have the trailer hooked up you would get almost no voltage at the brakes with current going through the connector. I am not sure if RAM limits the amount of voltage that the controller puts out if the TV is not moving. I read that when ford first came out with there controller that some of the people were getting tickets for non functioning brakes when the DOT checked them. The problem was the brake controller only putout a small voltage if it did not detect that the TV was moving. This may be why you do not get full voltage when the truck is not moving. (just a theory tho I have nothing to say this is the case)
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