Also posted in the trailer section but didn't know how often people read that.

OK so I have had my controller in my truck for about 4 years and it works fine with my race car trailer which only has 1 electric drum brake axle.

Problem is that with my new boat trailer which is electric over hydraulic disk brakes, it seems the controller is providing to much brake. To the point of locking up the tires sometimes. I have the controller all the way down to as low as it will go.

Questions

-Could my controller not be compatible with more than 1 brake axle?
-Is a different controller needed for electric over hydraulic brakes?
-If I need to get a different controller what is a good one to get? I have mine mounted in my Super Duty in the hole under the 4X4 switch and would like to keep it there. About 1.5 inches by 4 inch hole.

Not all of the elec/hyd systems are compatable with all of the controllers. I would check with the manf. of the elec/hyd unit to see what they recommend.

This site has some good info http://www.brakecontroller.com/proportional.htm