Just some additional information. This trailer is used on 3-4 trucks. So I want whatever is needed to be on the trailer.
Also all the batteries are deep cycle marine batteries. They all are in good shape.
The trailer does have a solar charger. It works OK if the trailer is not used very often but if you use the trailer regularly it does not keep the batteries charged. The wire from the truck is needed. The reason I know this is one truck's charge wire was not working and the batteries would go low after raising or lowering the dove tail several times.
I also thought about a diode. Will that work??? The reason I think it will not is that the current is always going toward the trailer anyway. The diode would stop a back feed but not an "over" feed.
I need to limit the current draw to about 30 amps. That would easily charge the batteries but would not blow the fuses in the trucks.
The Ford F350 is the worse. It has two sets of fuses. One for the truck and another for the trailer plug. Some times the trailer charge circuit will blow the fuse in the trailer box and a feed fuse in the main box. The main box is stuck under the washer fluid pump and is a pain to change.
I am thinking about a relay that is close when it has no power on it. This would allow the batteries to charge. Then run a wire from both the winch and hydraulic pump that would energize the relay whenever either was used.
It should be a simple thing but It has me stumped. LOL The issue is whenever the trailer battery voltage goes below the truck batteries then the charge wire tries to carry enough current to run the functions.
If the trailer was used on ONE truck I would just run a heavy wire separate wire to keep the trailer batteries charges at all times.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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