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Old 03-27-2018, 10:33 AM   #1
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Not an RV wiring question

Greetings all.

Just got a 16' flatbed trailer to haul some things. It has brakes and the small sealed battery for the breakaway. The wiring is missing. I want to do a 7-pin.

The question is charging the small battery. Does it charge off the truck thru the 7-pin? Or do I need some type of charger?

Thanks for the help.
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Old 03-27-2018, 10:56 AM   #2
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I tow a Boy Scout trailer that has that and it charges through the connection.

Marty
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Old 03-27-2018, 12:55 PM   #3
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Quote:
Originally Posted by Biker View Post
Greetings all.

Just got a 16' flatbed trailer to haul some things. It has brakes and the small sealed battery for the breakaway. The wiring is missing. I want to do a 7-pin.

The question is charging the small battery. Does it charge off the truck thru the 7-pin? Or do I need some type of charger?

Thanks for the help.
Sure does. Check this out: https://www.etrailer.com/faq-wiring.aspx
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Old 03-29-2018, 07:15 AM   #4
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Thanks for the help. Took care of it yesterday.
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Old 03-29-2018, 09:38 AM   #5
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Check your truck's 7 pin connector to verify the pin is supplying voltage to the trailer. It should be in the 13+ volt range with the truck running and 0v when not running.

If it is not supplying voltage, there is likely an additional relay that needs to be added in your truck's fuse block to complete the circuit. I know that my F150 was like that.
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Old 03-29-2018, 01:44 PM   #6
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The original question taught me something and that is that I am clueless about this.

So I have been camping in the same spot for 6 months and will likely be here another 6 months.

My toy hauler (Ice House so model makes no difference as I am the only person in these forums with one.)

Does shore power charge that littl baby battery or before I go on my next adventure should I manually charge with an external battery charger. I would hate to be on the road and need those electric brakes and hurt someone out of my ignorance. And that is not in any manual I have.

Thanks and god bless. Happy Easter and safe travels
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Old 03-29-2018, 02:42 PM   #7
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TonyShope, For anyone to really help you it would be nice if you supplied the make and model of your ice house toyhauler. Since you ask about shore power, giving the make and model of the power distribution panel will help a lot. Since many of us are not familiar with the rv it will be hard to give advice without the mentioned info. Unless it is a home-built unit you should be able to find it on the web. The reason I mention home-built is I have a neighbor who buys older used pups and small rv's and converts them for ice fishing and hunting and sells them. He's been at it for about 8 years.
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Old 03-29-2018, 05:34 PM   #8
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Just something to think about on that trailer brake backup battery, some are not rechargeable batteries.
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Old 03-29-2018, 06:02 PM   #9
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The baby battery is for the break away emergency brakes. If the break away cable is pulled loose, it locks the brakes. On some of the cargo trailers the battery is non rechargeable.

The power from the truck brake controller energizes the regular brakes for stopping.
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Old 03-29-2018, 09:20 PM   #10
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I thought that was obvious. Maybe someone didnít?
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Old 03-30-2018, 06:08 AM   #11
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make and model of the power distribution panel will help a lot
It is a FR/Greywolf 17KL is the power distribution panel the same thing as the fuse box fuse panel?
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Old 03-30-2018, 08:38 AM   #12
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Quote:
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It is a FR/Greywolf 17KL is the power distribution panel the same thing as the fuse box fuse panel?
Yep
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Old 03-30-2018, 10:27 AM   #13
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This is my panel
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Old 03-31-2018, 07:04 PM   #14
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This is my panel
That is the panel that is in my TT and it has a converter to charge the battery while on shore/generator power.
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