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Old 06-30-2014, 06:20 PM   #1
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Battery terminals

A question for the electrical minded.I built a motorized trailer mule for my trail ,so that I can move it around without my truck.I used a 12 volt ATV winch motor and now want to wire it up to the battery.I have the 2x 6 volt ones on my 15' Escape .But don't know which terminals to attach the Winch motors positive and negative leads to.One battery has two black wires coming from the trailer,one to the negative terminal and one to the positive terminal.The other battery has a red wire to the positive and a black wire to the Negative terminals.

Would I use the Red positive from one battery and the black negative from the other battery or?
Thanks for any help.
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Old 06-30-2014, 06:45 PM   #2
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It would depend on how they wire them at ETI, either in series or in parallel (as in the drawings below). I would assume it's in series, since you want 12V output. That would mean you can attach the winch motor positive to either positive, and the ground to the opposite battery ground.
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File Type: jpg 6 volts in parallel.jpg (38.6 KB, 3 views)
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Old 06-30-2014, 07:18 PM   #3
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ETI would not wire them in parallel as this results only in 6 volts, they have to be wired like the first picture, in series, in order to get 12v to the trailer. Thus you ant to connect to the positive on one battery and the negative on the other battery, or the plus on the left one and the - on the right one in the first picture above.
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Old 06-30-2014, 07:26 PM   #4
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Thanks for the quick replies.But neither example above looks the same.This is what it looks like.It is hard to tell as the wires disappear into the trailer from there.But I do think it is the red positive from one side and the black negative on the other one ,hate to fry my motor ,hooking it to the wrong ones.Anyone else?
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Old 06-30-2014, 07:38 PM   #5
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The top diagram in the post from rbryan4 shows how you have to connect the wires to supply 12v to your mule.

The diagram that you supplied is "wrong" in that the 2 center black wires, one from the positive and one from the negative, are unlikely to connect with the other black wire. If they did you would have a short circuit.

Just use one positive terminal on one battery and the negative terminal on the other battery. Add a jumper cable or battery cable between the other two.

This is the second time today the lack of an electrical schematic has been a problem for owners. I really wish there was a schematic available.

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Old 06-30-2014, 08:10 PM   #6
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In an electrical schematic a black dot would indicate a connection and in that case, the diagram is "wrong". If your black dot represents the hole into which the 4 wires disappear then the mystery to me is: why aren't the two center terminals simply jumpered and why does the one battery have two black cables?

The only answer that I can see is that the two middle cables, at some point out of sight, are simply connected together.

Until the exact situation is known it would be much simpler to just undo the existing connections, set them aside and hook your own cables directly to the battery with the center terminals jumped.

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Old 06-30-2014, 08:15 PM   #7
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I did a little more investigating and sliced open the protective covers over the wires and can see that they doubled back with the one black wire and it ends up being as the example #1 above.Why they did that I don't know,just to confuse me I guess
I'll have to leave it now until Wed and will let you all know how it all went.I will post a video of what I built and what I used to do it ,once I have time.
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Old 06-30-2014, 08:27 PM   #8
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Hi Guys,
Ok this might be a dumb reply but if you are using a volt meter by test the terminals wouldn't that tell when you have the 12 volts you need. Then you would know which terminals to use for the power dolly.
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Old 06-30-2014, 09:00 PM   #9
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Not really necessary. They're connected in series in order to supply 12 volts, i.e., 6V + 6V = 12V. Connecting the winch motor to the positive on one battery and the negative on the other would supply power, since they are interconnected in series. Ron's absolutely right though -- a wiring schematic would be nice to have.
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Old 06-30-2014, 09:32 PM   #10
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Yes having the schematic is always your best bet. I am not a electrician but I do understand what parallel and series circuit are and if you have a volt meter you should be able figure out what your connections are. But if someone is not comfortable with working on electrical circuitry they should never attempt to blindly try to figure out a electric circuit.
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