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Manual Override Will Not Work Twice in a Row with an EOH Actuator  


I just purchased a new 40foot trailer with Dexter 12k oil bath axles with electric over hydraulic brakes. I have a 2017 Ram 3500 chassis cab truck with the built in brake controller. It has the heavy EOH option in the settings which I chose. When engaging the slider on the controller I have no trailer brakes. I can engage the slider and put the truck in reverse and the trailer brakes work and will not allow the truck to move. If I immediately go to drive and engage the slider it holds there as well but if I try to engage it a second time there are no brakes. I installed an aftermarket controller designed for EOH and I get the exact results as when I used the built in controller. I even took the constant hot wire in teh 7 way plug and connected it to the pin that is for the brakes and the brakes activated fine in both directions. Is it possible the brakes need adjusting? Any help is greatly appreciated.


Expert Reply:

The issue you are experiencing with your trailer brakes could be attributed to either a fault in the brake controller wiring or a fault in the electric over hydraulic actuator wiring. I recommend starting with the brake controller wiring. In order to test this you will need to use a multimeter like part # PT89ZR. Once you obtain the multimeter I recommend turning the settings on the brake controller up to their max output. You can then have someone engage the manual override while you are checking varying points in the brake output wire (usually blue) that runs from the 7-way to the brake controller. You should be getting a full 12 volts at each point. If you do not then you will need to repair the wire as necessary or since it is factory wiring, it would likely be easier to just replace it with part # 10-1-1.

If the above does not fix your issue please let me know what electric over hydraulic actuator you have and I would be glad to walk you through the testing procedure for that as well.

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