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Old 02-10-2020, 03:56 PM   #1
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Holiday Rambler trailer brakes

Hoping someone can help me with this problem. I have a 2001 holiday rambler ambassador. It has a 5.9 Cummins diesel.

I have found with the engine brake activation the brake lights turn on. As has been mentioned in many posts here this creates problems went towing a heavy trailer. My trailer is 7000 pounds and has electric brakes. If I turn the engine brake on the trailer brakes go to full.

First solution is I have ordered a proportional brake controller which I will install in a few weeks.

However this doesnít solve the overall problem of the brake lights being on whenever the engine brake is on. This is definitely not my preference.

I checked some other threads on this and found references to fuses and relays however could not find anything labeled as they advised. I have taken the switch apart it has eight leads into it and several jumpers, I doubt I will be able to figure out how to disconnect the lights from the switch. And Iím a little nervous about messing with it. I do not want to blow something out of the engine computer.

Anyone solve this problem on this particular coach? If I canít figure it out, and no one can tell me how to do it, I will likely put a momentary switch on the dash which will allow me to disconnect the brake light feed to the trailer brake controller.

Thanks in advance for any advice
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Old 02-12-2020, 12:39 PM   #2
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I agree, a Tekonsha Prodigy proportional brake controller will really help.
I assume you have air brakes?
I used a volt meter on the inline brake pressure switch terminals in front of the drivers area until i found one that activated when the brake pedal was pressed. I wired my trailer brake controller to it. (Our coaches have had two brake pressure switches in the front generator area.)
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Old 02-13-2020, 08:40 PM   #3
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Update

Update on this one.

I went to the Houston RV show today I was speaking to a gentleman from a company called master hitch.

He suggested a roadmaster universal brake light switch. It attaches to the brake pedal uses a laser to measure the distance between the brake pedal and firewall, when it detects the pedal is moving it turns on the switch.

So I can connect the brake controller to this switch instead of the brake lights And the trailer brakes will only be activated when I actually press the brake pedal.

This still does not solve the problem of having brake lights on with the engine brake, it also does not turn the brake lights on if you manually activate the trailer brake controller. Which itís supposed to. So itís still not ideal but itís better than the situation Iím in now.
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brake, brakes, holiday rambler, trailer



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