what is a battery isolation solenoid
This battery isolation solenoid shuts off the 12-volt feed from your vehicle battery to 12-volt accessories on your trailer when the ignition is turned off. This lets you run the trailer's electrical components without draining your battery. You may be able to use the existing 12V feed at the back of your truck to charge your trailer battery while driving but you will need to install a battery isolation solenoid to disconnect this line when the tow vehicle is off.