Hopkins The Engager 20099 Engager Break Away Systerm W/Battery Meter (Retail Box)

• Activates trailer brakes upon separation from tow vehicle
• Built-in battery meter with LED test lights
• LED's indicate: fully charged, re-charge, or charging
• Convenient test button verifies battery charge
• Built-in battery charger that charges battery while plugged into the vehicle

I have the version of the product with the breakaway switch, battery meter, and charger. There are a bunch of versions so make sure you get the part number you want. This was easy to install on my trailer, a flatbed with dual axles (note that wiring/electronics is something that I do frequently). The instructions were clear. It replaced an old non-charging type with a failed switch. I like the charge light as it tells me the connection to the truck is there and the test light lets me know the battery has juice. I never knew if the old one was going to work.

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Easy to setup, good instructions. The lights help you see what is going on (battery status, charging...) and diagnosing wiring issues is easy.

The included battery was already charged and the box is easy to mount on the trailer. Overall a great solution, you won't need anything else to setup a breakaway system on your trailer.

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I thought I was a big fan of these, but I am learning that after they have been on the trailer for more than a year or two, they get ruined by what I assume is sun/ultraviolet damage. The plastic film that covers the test button and the indicator-lights cracks and breaks which in turn lets the water into the unit. This has happened on both of my trailers recently, and the damage is identical. This is not caused by abuse because there is no reason to be touching the covering on the indicator lights. This would be a nice product, but it clearly has a relatively short lifespan.

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This is a very affordable, simple to install charges it's self when the trailer is hooke to a vehicle and works very well could not be any happier with it.

Original box leaked water in, shorted out battery. Box was hard to open. Looked online and found this replacement. Easy to open, weather sealed, nice test light to see quickly battery condition. Very happy.