Bought to disconnect my trailer's battery from the car when it's not running. I installed it on the firewall and connected one side to the car battery via a circuit breaker. The other side is connected to the trailer wiring harness. It is powered by the daytime running lights and therefore only lights up when the vehicle is moving. I've only had it installed for a few months and so far everything is working fine. Haven't used it with a trailer yet. You can hear it from the car's cockpit when it turns on. It seems to be well done with secure terminals.
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