As you can see, I added and wired the two Attwood battery selector switches and a fourth battery to the system (Battery 2) and wired all the batteries in parallel. Add circuit protection for the Blue Seas fuse panel at its connection location to the boat battery switch. If the trolling motor batteries are near the bow of the boat I would consider adding circuit protection at each end of this wire to help reduce the risk of a catastrophic fault. Most people don’t use welding cable on boats or cars because it is not oil resistant. Wiring a boat trailer is something that many boaters find themselves needing to do sooner or later.
I was doing a pre-season inspection of my trailer, which was only 2 years old at the time, and I noticed the ground wire on the trailer is screwed to galvanized metal, and the screw is not tight.

The standard four prong connector to connect the trailer to the tow vehicle is perfect for a simple trailer light system.Notice the four prong connector on my boat trailer has 5 wires coming out the bottom. It may be to just connect the trailer lights on your vehicle, or you may find yourself rewiring the whole trailer with new LED boat trailer lights and a new wire harness.I have had light issues on an old trailer and to be honest it was quicker and way less hassle just to pull out the old wiring and lights and start again with a fresh wire harness and new lights. A sure fire source of light problems!Make sure the ground wire on the trailer is attached to bare metal, not to painted or galvanized metal.
Many light assemblies use the mounting bolts as their ground connection, so clean the metal surface around the mounting bolt holes down to bare metal.
Poor ground connection to the trailer frame is a common problem with lights that don't work.Below is a simple wire diagram for a standard four wire light harness.
They are available at marine hardware stores and are a crimp connector with a waterproofing adhesive inside and an integral heat shrink cover to seal the connection.

The white wire (ground) on the following boat trailer wiring diagram is drawn in grey so that you can see it against the white background.
One to control the boat trailer brakes, and one auxiliary power to charge the battery that you will need to have on the trailer so the brakes can be energized should the trailer come unhitched from the tow vehicle.Obviously you will need a six prong connector to connect the trailer to the tow vehicle in this situation.

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