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How to Test Your RV Breakaway Switch


To test your RV breakaway switch, keep the trailer securely hitched, disconnect the 7-way cord, pull the switch pin, and verify that the trailer brakes engage. Reinsert the pin promptly after checking brake operation, then reconnect the cord. The system relies on a charged onboard 12-volt battery, so battery condition is an essential part of the check.

What Is an RV Breakaway Switch?

A breakaway switch is a safety device that automatically activates the trailer brakes if your RV separates from the tow vehicle. Its purpose is to help slow and stop the detached trailer.

The switch uses power from the RV’s onboard 12-volt battery to apply the brakes independently of the tow vehicle’s electrical connection. A discharged or disconnected battery can prevent the system from working.

How Does a Breakaway Switch Work?

The breakaway switch has a removable pin connected to a lanyard, or cable, that attaches to the tow vehicle. If the trailer separates from the tow vehicle, the cable pulls the pin out of the switch.

Removing the pin closes an electrical circuit, allowing battery power to activate the trailer brakes. Reinserting the pin deactivates the switch.

What Should You Inspect Before Testing?

Before testing, review your RV owner’s manual and the breakaway system manufacturer’s instructions for any equipment-specific requirements.

Quick Inspection Steps:

  1. Check the Lanyard: Look for fraying, cuts, or other damage. Replace a damaged lanyard before towing, and make sure it does not drag on the ground.
  2. Check the Switch and Pin: Inspect for visible damage and confirm that the pin is fully seated before beginning the test.
  3. Check the Battery: Make sure the onboard battery is connected, charged, and maintained according to its manufacturer’s instructions.
  4. Check the Attachment: Confirm that the lanyard is securely attached to the tow vehicle at the location specified for your equipment. Route it so normal turns do not accidentally pull the pin.

How Do You Test the Breakaway Switch and Brakes?

Perform the test in a clear, level area with the trailer securely hitched to the tow vehicle. Keep everyone clear of the wheels and the space between the truck and trailer.

  1. Disconnect the 7-Way Cord: Unplug the trailer’s electrical cord from the truck before pulling the breakaway pin. Leaving it connected during testing may cause an error message or damage the brake controller.
  2. Pull the Lanyard Pin: With the truck and trailer stationary, pull the pin from the breakaway switch. A helper standing safely beside the trailer may hear the brakes activate, but sound alone does not confirm proper braking.
  3. Verify Brake Engagement: From the driver’s seat, attempt to move the truck forward slightly and slowly. You should feel the trailer brakes resist movement. This is a brief check, so stop once you have assessed brake engagement.
  4. Check for a Problem: If the trailer moves freely or brake operation is uncertain, stop the test. Do not tow until an authorized RV dealership has diagnosed and corrected the problem.
  5. Reset the Switch Promptly: Reinsert the pin fully as soon as the check is complete, whether the brakes worked correctly or a problem was found. Do not leave the pin out while troubleshooting.
  6. Reconnect the 7-Way Cord: Once the pin is fully seated, reconnect the cord to the truck. Confirm that the lanyard remains properly attached before towing.

What Breakaway Switch Safety Precautions Should You Follow?

  • Never Use It as a Parking Brake: Leaving the pin out continuously powers the brakes. This can drain the battery and potentially damage the switch contacts and brake magnets.
  • Attach the Lanyard Correctly: Secure it to the truck frame or the attachment point specified by the equipment manufacturer. Do not attach it to the safety chains or tow ball.
  • Leave the Pin Inserted When Unhitching: Detach the lanyard from the truck before driving away. Keep the pin seated in the breakaway switch to avoid accidental brake activation.
  • Verify Braking, Not Just Sound: Hearing the brakes activate does not replace checking that they resist trailer movement. Do not use tire lockup as the sole measure of proper operation.

Before your next trip, inspect and test your breakaway system using your RV owner’s manual and equipment manufacturer’s instructions.

Disclaimer: The information contained in this article is deemed to be true and accurate at the time of publication. However, due to the evolving nature of our products and services, there may be changes or updates that occur after this article was published. We encourage users to verify the contents and consult with their dealer or Keystone RV for the most current information. If you have any questions or require further clarification, please do not hesitate to contact your dealer or reach out to Keystone RV directly.