Troubleshooting Hopkins Agility Brake Controller

Question

Question:

When I wired the brake controller the trailer connection light is on all the time. even with the truck off and trailer disconnected. When I hit the brakes nothing happens but when I hit the red button the short circuit comes up. Thanks for all your help.

asked by: Bobby L

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Expert Reply:

What you are describing does indeed sound like a short circuit somewhere in the brake output circuit between the brake controller and the trailer connector at the rear bumper. You can confirm this by severing the blue wire a few inches behind where it exits the brake controller. If the problem goes away, you have confirmed the short. The first place to look for the short would be the trailer connector. Closely examine the connector for damage or corrosion. If you can find white or green corrosion on the pins of the connector, the corrosion might have spread to the interior of the connector to where the wires connect to the terminals. Clean or replace the connector as needed.

If the connector checks out okay, the problem lies in the wiring between the connector and the controller. Cut the wire feeding the # 2 terminal on the trailer connector. Use a butt connector like part # 05732-2 to attach a length of 10 gauge wire, like part # 10-1-1 long enough to pass under the vehicle, into the engine compartment and through the firewall to the brake controller. Join this wire to the blue wire you cut earlier, thus abandoning the existing brake output circuit.

I have linked you to a Brake Controller Troubleshooting FAQ article that you might find helpful.

expert reply by: Mike L

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Answer 1

If applying the manual over-ride lever on your Hopkins trailer brake controller, such as the Agility #HM47295, sends brake power back to your Tundra's 7-way then you know the circuit is functioning. You can test by having a helper press the lever…

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Answer 2

The Hopkins Agility you have now is notoriously known to be unreliable. I would try unplugging it and plugging it back in to see if a hard reset fixes it but most likely you would need a new controller like the much more reliable P2 part #90885.

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Answer 3

If the power display on your Hopkins Agility brake controller drops from 10 to 0 when you apply the brakes this could mean that you are losing your trailer connection at the 7-way or that your controller is not correctly installed, meaning level and…

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Answer 4

To replace the 7-way trailer connector on your 2019 Chevy Silverado 2500 I recommend the Reese Multi-Plug Wiring Harness for Factory Tow Package - 7-Way and 4-Way Flat Trailer Connectors #74682 for a connection near the hitch. If you want to replace…

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Answer 5

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 6

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 7

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 8

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 9

To determine the size of the brake assemblies you need you have to measure the depth and width of the hub drum on the axle like what you see in the picture I attached. The most common size is 2-1/4 inch wide like the #T4071600-500 that you…

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Answer 10

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 11

Traditionally, trailer manufacturers did not use electric brakes on boat trailers because the brake magnet wiring and trailer wiring did not always have the best insulation or water protection. These days, more and more manufacturers are using…

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Answer 12

Hey Richard, thanks for reaching out! The Dexter DX7.5 Drop-N-Go Brake Actuator #099-175-00 is a great option for a replacement actuator because it's a direct replacement for the common Model 60 actuators that were popular in the '90s.…

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Troubleshooting Hopkins Agility Brake Controller

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