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If you look closely, the diagram actually show charging a bank of batteries
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See fuse 18, and relay 5.
The battery charge circuit is designed for just that, to charge batteries in the trailer. I would never suggest that it be used for running a winch, or paralleling the truck and trailer for emergency starting. I have installed deep cycle batteries in many different trailers for many different reasons, winches, hydraulic tilt, hydraulic landing gear, inverters, or just general interior lighting. I’ve done them all the way I described.
For example, let’s look at the task of winching a vehicle onto a trailer. You can leave the truck shut off while working for this hypothetical. Your winch draws 300amps from the battery on the trailer for 6 minutes as you pull the vehicle on. That’s 30amp hours (300 amps x 0.1 hrs). You start the truck with no issues because the winch was completely isolated from your starting batteries. As the truck is running and you’re driving, the battery on the trailer is recharged in about an hours time. (30 amp charging rate x 1 hour of drive time).
[mention]Bradd Barmettler [/mention] with regards to the EOH brakes on your boat, you may want to double check your wiring. If the 12v+ feed for the actuator is fed directly from the trailer charge circuit, what happens in the event of a break away. That 12v feed should be tied to an on board battery so that if the trailer comes unhooked from the truck, it can still actuate the brakes. This is usually accomplished with one larger breakaway battery. If the breakaway is wired like a trailer with standard electric brakes, but the actuator is fed from the truck, then when the breakaway pin is pulled, a 12v signal will be sent to the controller, but there will be no power to the actual pump, and the brakes will not apply.
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