Thursday 15th, February 2018
Category : Jeep Upgrades
We found out the hard way that the trailer will 'suck' the car battery dry when left connected. The connection on the 7-pin plug supplies constant 12 volts to the trailer. So the trailer battery keeps charging and charging and charging.|
We had three instances where the Jeep almost didn't start. Once back home, the research started. To make a long story short, we needed a way to disable the charging when the Jeep alternator was not providing power (=engine not running).
There are some rather expensive solutions out there, but we settled for the cheapest and simplest way, a relay. That's what this clunky 'solenoid' is, a simple relay.
I found this solenoid at 4 Wheel Parts for $21.
The big connectors on the side are battery-in and battery-out (to the 7-pin harness). The smaller connector goes to a wire that supplies power when the engine is turned on. The wiring is simple and I will follow up with the gory details once I don't have to freeze my fingers off in this cold.
And beside this solenoid installation, I'm still waiting for a time delay relay that will keep the dashcam and other accessories charged after the engine is turned off and the key removed. I hope to be able to install both at the same time.