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Unread 07-31-2010, 12:47 PM   #1
renegadeguy83
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Help with a trailer battery for charging

My buddy just bought a 22 foot trailer with a winch mounted on the tongue of the trailer. I was wondering how to hook the battery to run the winch and charge off the 7 pin connector at the same time. Any thoughts?

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Unread 07-31-2010, 01:23 PM   #2
Skyryder
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Just thinking out loud as I have never done that, , , ,

The seven pin connector can be set up to run accessories on/in a trailer, with that said I don't know why you couldn't set up a battery isolator on that circuit and use your tow vehicle to charge.
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Unread 07-31-2010, 02:55 PM   #3
renegadeguy83
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Unread 07-31-2010, 10:03 PM   #4
wvjeepguy76
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Thanks for the Post!!! I need to get that battery charging on my trailer!!!
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Unread 07-31-2010, 10:57 PM   #5
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lets just keep this simple. you cannot use the 7 pin 12v line to run a winch..... charge a battery that runs a winch.... sure. you should add a battery [if you dont already have one] to the trailer if you want to use the winch. when you use the winch, make sure you disconnect the 7 way or it will more than likely blow the fuse on the 7 way 12v line under the hood.

i have an 8k winch on my 36' car hauler, a set of batteries to run it and any other 12 volt accessories while im camping, i have 2 just because i double up when i can. i use the 12v line on the 7 way to charge the pair whenever its plugged in to the truck.

hook the trailer mounted battery to the winch control per the specific winch model you have. that is assuming the control box is there. for the charge line, splice into the 7way 12v line where its convienent on the trailer tongue harness and then weatherproof your connections. a piece of good 10g is adequate for a charge line. connect the charge line to the trailer battery and youre done with part one.

part 2. make sure your trailer battery has a good ground. if the winch gets its primary grounds through the case/mounting bolts, then your ground wire from the battery to the frame should be 4g. if the winch ground is directly wired to the battery, then you need to add an additional line, minimum of 10g, from the battery ground post to the trailer frame. the 10g ground purpose is to create a common ground between the [2] 12v systems and allow the 7 way line to charge the trailer battery.

this would be a good time for you guys to go thru the wiring on the trailer and make sure alls good. the trailers primarily grounded to the truck via the ball mount. the ground that runs through any trailer plug is basically a second ground. its purpose is to maintain a common ground when the trailer hits a bump or the ball is rusty etc...

make sure the ground in the 7 way is good while your in this project. i replaced mine with a new wire when i added my batteries. i also had to replace the connection to the frame on the truck side. it was corroded and had a poor connection.

good luck, any questions ask. this is what we do over here. my buddy also runs the service dept for a major rv center. we got this covered.
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Unread 07-31-2010, 11:13 PM   #6
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you can add a small isolator if you want on the trailer side, even a charge relay thats ignition controlled. id recommend a charge relay if you want to isolate the battery systems. the isolator will steal some voltage from the charge line, and youre already 20' from your truck batteries. the relay wont steal anything. OR, you can change the 12v constant line on the truck side to a 12 switched/ignition line by adding a relay into the line under the hood. thats fairly easy enough.

i didnt put anything in my system because for me, the trailers not plugged in unless im going somewhere and the system will be 'charging.' when i get where im going and staying, the trailer gets unplugged. youll get some equalization, dependind on the batteries condition, if the trailer is left plugged in for a long time and the vehicle isnt running.
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Unread 08-01-2010, 11:05 AM   #7
renegadeguy83
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Thanks so much for the info guys. I will put it to good use. I will let you know how it went
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Unread 08-01-2010, 07:04 PM   #8
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Unread 08-02-2010, 07:24 AM   #9
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Originally Posted by renegadeguy83 View Post
Thanks so much for the info guys. I will put it to good use. I will let you know how it went

Probably the best thing to do would be to ask a tech guy at an RV place what to do and what to get. They have RV battery isolators that would allow you to do what you want.
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