Carlisle Hydrastar Electric Over Hydraulic Brake Actuator Does Not Cycle On  

Question:

Expert Reply:

The Hydrastar actuator # HBA-10 should be grounded to both the trailer frame and through the trailer connector. Make sure the grounds are clean and free of corrosion.

Since your actuator is not cycling, this could mean that there is an electrical problem or a malfunction with the motor, or even a problem with the brake controller. I have included a picture of how the unit should be wired up. Any corrosion could be a cause of the problem. Make sure that the trailer and vehicle connectors are clean and free of corrosion on the pins and around back where the wires attach.

You can also make sure that the Hydrastar white ground wire is connected to the vehicle ground. They are very particular about this ground connection and it must be connected to the vehicle ground. Also ground it to the trailer mounted batter and not the trailer frame.

To further test the unit, leave on the blue, black, white, and yellow (or blue with white stripe) wires. Make sure it is disconnected from any other wires going to the tow vehicle or breakaway system.

Use a separate 12 volt battery and connect the white wire directly to the negative terminal then connect the black wire to the positive terminal. The motor should NOT run at this time. If it does then there is a problem inside and it will need to be repaired by Carlisle.

Next leave the white wire connected to the negative terminal then connect the blue and black wires together to the positive terminal. The motor should now run and pressurize. If it does not, it will need to be repaired by Carlisle.

Then you can leave the white wire attached and connect only the yellow or blue wire with white stripe to the positive terminal. the motor should run and pressurize. If not, it needs to be repaired by Carlisle. If everything checks out then reconnect the unit to the trailer connector and repeat the tests again. If it does not work then there is a trailer wiring problem or problem with the brake controller.

The brake controller you are using may or may not be compatible with electric over hydraulic brakes. If it is then make sure it is in electric over hydraulic mode. If you can tell me which controller you are using I can determine its compatibility. It may only be compatible with adapter # HBA-CAM.

expert reply by: Michael H

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