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Old 02-18-2014, 12:57 PM   #1
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Power tongue jack question

Our trailer is in storage now and I would like to lower the front a bit to help the snow and ice off the roof ( it warming for a bit ). Question is will the tongue jack work if I plug the 7 pin from the truck to the trailer. I removed the battery from the trailer while in storage. Also if I do it manually does anyone know what size socket fits the bolt ........

Thanks Joe

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Old 02-18-2014, 01:41 PM   #2
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I'm pretty certain that the jack is powered by the house battery. If you don't have a battery available, you could use jumper cables from your truck's battery to the terminals on the TT.

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Old 02-18-2014, 03:38 PM   #3
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Yes, tongue jack is 12V powered. If all wires, circuit breakers, relays, and fuses are good on truck and trailer, then using the 7way connector on the truck will apply 12V to the trailer.
Not all tongue jacks use a socket, some are a t slot also. Depends on the make.
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Old 02-19-2014, 09:05 PM   #4
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Since you say "bolt" I'm gonna assume it'll be a 3/4" but it sure would help if you told us what brand jack.
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Old 02-19-2014, 09:30 PM   #5
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So it doesn't matter if the battery is disconnected? The 7 pin from the TV will power the jack? Do the battery cables need to be connected together?
I'm electrically challenged, so don't know how this stuff works. Have never used a power jack either, but we have a new trailer ordered that will come with one.
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Old 02-19-2014, 09:49 PM   #6
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I am assuming that the power ( red wire ) for the jack attaches to the house battery. If this is disconnected which it surely is the jack can't work. Did you receive a jack handle when you purchased the trailer to operate the jack in manual mode? If not ,contact the dealer and get one but in the meantime use the correct size socket with a 6" extension to reach the bolt. Use a long handle socket wrench to increase your leverage. Good luck
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Old 02-19-2014, 09:52 PM   #7
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tongue jack

do not put the battery cables together if you do it will make a dead short. just make sure the battery cable ends are not touching metal plug in the 7pin and operate the jack lee
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Old 02-20-2014, 05:49 AM   #8
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I suggest you do lots of learning about 120V and 12V systems then, first.

Second, the jack wire and battery hot wire would need to be connected together, and that's about it; as long as all the charge systems on the truck are good.
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Old 02-20-2014, 10:48 AM   #9
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I'm learning. Our trying to at least.
Having the jack hot wire connected to the battery hot makes sense. So, do they come wired that way, or is that something I would need to splice in to if I wanted to run the jack of the TV? Maybe something could be pre wired at the dealer so I could just connect it when needed?

When I store my unit for the winter I remove the battery so that it doesn't sit for long periods of below zero temps. It sure would be nice to be able to put it away and take it back out without the need to mess with the battery.

Thanks for your patient explanations!
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Old 02-20-2014, 10:51 AM   #10
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Once you get it, you'll realize it's not as near a big deal as you're thinking it to be.
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Old 02-21-2014, 08:51 AM   #11
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Thanks everyone. I ended up lowering the jack manually. The dealer I bought the TT from was less than useless so I never knew if I had a manual crank or not, however I took a chance that the socket that fit the leveling jacks would fit the tongue and fortunately it did. So all is good ...........


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