This engages the trailers brakes (if fitted) or stops the trailer if it becomes detached from the car. This wire is typically used to keep the trailers battery charged while driving. Since the break-away is there to stop your trailer/toad in the event of a failure of a hitch part, you shouldnt attach it to any part of the hitch including the receiver or ball mount. Use a breakaway cable or secondary coupling.

I wouldnt recommend more than 20amps through this wire though.

It is typically either fused at 30 or 40amps. We follow a consistent philosophy, including: leveraging consumer insights to drive product innovation, delivering end-user value through efficient manufacturing strategies, maintaining rigorous quality control measures ensuring peak product performance and providing premium consumer support through a dedicated team of support specialists and mobile/on-line resources. The 12V power wire in the 7-way plug should be connected to the tow vehicles battery. Hopkins strives to make the consumer experience simpler and more rewarding through innovation and value. Provides a secondary safety connection between your car and trailer, applying a trailer brake in the event of a breakaway. The switch then sends a signal to the brakes on the trailer, activating them and stopping the trailer. Product solutions offered include: Towing electrical and RV levels snow and ice tools vehicle cleaning tools DIY oil change and fluid maintenance tools automotive air fresheners vehicle organization and mobile accessory products automotive protection products including seat covers, steering wheel covers, floor mats, and sun shades and tire safety solutions. The breakaway switch is the main component of the breakaway system, which detects when the cable connecting the trailer to the towing vehicle is broken or pulled. Hopkins is a leader in the manufacturing, distribution and marketing of quality, innovative towing and vehicle accessories for the automotive do-it-yourselfer, installer, recreational, agricultural and commercial user.

Connecting trailer breakaway cable