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Old 08-22-2011, 05:55 PM   #1
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TV battery jumper to tongue jack.

I'm trying to make a jumper from the TV 7 pin to the tongue jack so I don't have to lug my 2 heavy 6 volt batteries to the storage lot just to bring my trailer home for maintenance. I bought a female 7 pen and hooked up wires to the aux and ground and spring clamps on the other end. No go. I put a volt meter on the TV 7 pen and get nothing out of any pen. I grounded to the TV and then went around the horn with the + lead. Nothing. With the trailer plugged in to the TV everything works fine. What am I missing? Jamie
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Old 08-22-2011, 06:20 PM   #2
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the tongue jack normally runs off the charge line pin not the auxilairy pin. Sorry I don't remember the pin # or color off the top of my head
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Old 08-22-2011, 07:37 PM   #3
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My tongue jack runs straight off of the battery. I just want to use the truck battery during storage retrieval (I keep the batteries at home so I can keep them charged). I could use a long wire from the truck battery to the jack but was hoping to use less wire. Jamie
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Old 08-22-2011, 07:51 PM   #4
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Looking at the back of the trailer side of a 7 way female plug, (meaning the screw terminals) 12 volt positive is the at 1 o'clock, and ground is at seven.

Follow the link, and scroll down the page to the 7 way diagram.

http://www.etrailer.com/faq-wiring.aspx

If you know which wires are positive and ground on the jack, you are good to go.
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Old 08-22-2011, 08:36 PM   #5
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Old 08-23-2011, 08:57 AM   #6
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Just plug in the cord from your truck and you should be fine. Remember that if you tow without a battery in the trailer, the breakaway feature will not work.
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Old 08-23-2011, 08:33 PM   #7
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Good call on the breakaway. My rationalization is that I'm only going less than a mile and never over 25 MPH from storage to home. I don't even put on the extension mirrors or load leveling bars. As for just plugging in the cord, that doesn't work. The tongue jack is hooked up to the battery only. So there isn't a hot lead from the truck battery on the 7 pen? And if so, why won't it show on my volt meter? Jamie
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Old 08-23-2011, 09:06 PM   #8
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Originally Posted by azflycaster View Post
Just plug in the cord from your truck and you should be fine. Remember that if you tow without a battery in the trailer, the breakaway feature will not work.
Just be absolutely sure that both of the loose positive battery cable ends are securely isolated from ground before plugging in the truck. Other than that, this seems by far the simplest solution.

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Old 08-23-2011, 09:26 PM   #9
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Interesting thread. The jack on my trailer is connected directly to the hot battery charge line from the tow vehicle. The charge line is connected to the trailer battery. If my trailer battery is removed, the jack on my trailer is connected directly to the hot battery charge line from the tow vehicle.

Sidebar: I call electric jacks "stranded jacks". I'm replacing mine with a front handle sidewinder jack.
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Old 08-23-2011, 10:10 PM   #10
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The "hot" line as you call it is the charge line to the trailer battery. In most TVs the key must be on to energize that line. In some TVs a fuse has to be added to the truck as well.
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Old 08-24-2011, 06:26 AM   #11
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Ken,

Richard brings up a good point. Do you know for sure that the "charge" line was ever live when unhooked?
Not sure how it's wired on your Ford, ours is fused and hot all the time.
Your FoMoCo manual should tell you.

Bob
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Old 08-26-2011, 11:02 AM   #12
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Bingo! for Richard in post #10. The answer to my whole problem was to have the truck ignition switch in the "on" position. Then everything works as I had hoped. I tried the acc. position initially but that didn't work. The longer I live, the more I learn. I think I'll need to live to 150 to lose my Knucklehead status. Thanks to all for your input. Jamie
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Old 08-26-2011, 11:11 AM   #13
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I was going to suggest using a bottle jack on a bunch of scrap wood to jack up the tongue if nothing else worked. Now I won't.

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Old 08-26-2011, 11:18 AM   #14
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Gene, Not a bad idea as a backup for when things go wrong, electrically speaking. I have had the up/down switch corrode and not work. It's not that easy to crank up with the emergency crank. Jamie
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