If this happens you would have just wasted a perfectly good new battery. The installation can be as simple as connecting two batteries in parallel to make one larger battery bank.

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Add a battery install. Reconnect after the installation is complete. Theres a few ways you can install a battery onto the trailer. The 10a 2 bank charger includes an integrated 65a acr for automatic charging of 2 battery banks off a single engine alternator. Attach one 40 awg cable per terminal to meet ratings. When your solar panel system was installed the company brought in an installation crew to work on your roof. Never install a new battery with an old battery.
Install a battery isolator a switch box for the batteries into the vehicle. Connect the yellow wire of the led to the quick connect terminal marked led. Connect the red wire of the led to a 1224v positive source through a 12a in line fuse. It is best to buy two new batteries and install them both at the same time. To do this you will need a new battery and some wire like 10 1 1 which is sold by the foot. The add a battery is as simple to operate as an on off switch yet effectively manages the switching and charging of two batteries from a single charge source.
Strip away part of the insulation from the disconnected alternator wire with a crimping tool and connect the bare lead to one of the isolators side terminals by loosening the terminal and retightening it with the wire lead under it. Turn the dual circuit plus battery switch to the on position when you get on the boat and off when you leave. The add a battery includes a dual circuit plus battery switch and an automatic charging relay. The mini add a battery plus simplifies switching with a dual circuit plus battery switch and allows you to charge at or away from the dock with the battery link charger. Disconnect battery connections before beginning the installation. Otherwise the old battery will form a current loop with the new battery drawing its charge for itself.
One is to connect it to the 12 volt pin on the trailers 7 way in place of the breakaway battery that is currently connected there then connect the breakaway battery to the new battery. E series dual circuit plus battery switch installation. Adding another battery is a good idea if you want to add a powerful stereo subwoofer system cabin lighting electric windlass wakeboard ballast pump or any of the other electrical and electronic accessories we all want. Mount the battery switch in an easily accessible location close to the batteries. Adding a battery to your solar panel system is a relatively simple process in terms of installation. You can think of installing a battery as more of an electrical project rather a roofing project.