Hayes Brake Controller Showing Higher Output than What the Controller is Set To


2011 gmc 3500. With min power set on 10 and max on50, when you touch brake pedal or manuel slide controller shows 75 . I have severed blue wire at controller and still 75 . Trailer has electric over hydraulic brakes, when you touch brake pedal in 4 sec. Trailer will slide tires . Has been working fine for years and wiring has not been changed.


Expert Reply:

The Hayes Genesis brake controller # HA81790 is compatible with electric over hydraulic brakes but it should not take 4 seconds for the brakes to actuate. I would double check the instructions for set up to make sure your controller is set up for electric over hydraulic mode.

If the controller is mounted outside of its range specified in the instructions then that can cause all sorts of strange things to happen. Brake controllers can get bumped accidentally so this is a possibility.

If the controller continues to put out more power than it is set to not matter what you do then there is likely a problem inside the controller and it will need to be replaced. I recommend the P2 # 90885 which is also compatible with electric over hydraulic brakes.

expert reply by:
Michael H

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