Can I Use the Brightway Breakaway Box to Test the Brakes and the Trailer Lights?

Updated 10/30/2025 | Published 02/24/2025

Products Featured in This Question

Replacement Breakaway Switch for Bright Way Trailer Breakaway Kits

(178)

$25.63

Hook Probe Circuit Tester

(67)

$13.14

Question:

On the bright way breakaway box it has built in leds lights to tell the user that the trailer lights are working, but it only has three wires coming out of the box. How do I set the box up to test all the lights as well as the brakes?

asked by: Jeff C

Expert Reply:

Hello Jeff,

Great question! The Bright Way breakaway box has three wires: black or Red (12V power from the trailer battery), blue (trailer brake wire), and white (ground). Its built-in LED indicators primarily monitor the breakaway battery and brake circuit, not the trailer’s running lights, turn signals, or brake lights. To test the brakes, ensure the battery is charged, pull the breakaway switch pin, and try to move the trailer if the brakes lock up, then they are working.

To test all your trailer lights, you'll need a separate method since the breakaway system only handles emergency braking. You can use a Hook Probe Circuit Tester #PTW2993, plug the trailer into your tow vehicle, or manually apply 12V to each circuit with a power probe or test light at the 7-way plug.

What kind of trailer are you working on?

expert reply by: Kate F

Kate F.

10/30/2025

Hey Jeff, how did your testing go with the Bright Way breakaway box and the circuit tester? Your update could make it easier for others trying to check both their brakes and trailer lights.