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Old 05-14-2012, 09:00 AM   #1
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Electric Tongue Jack

We keep our trailer at a storage facility so I do not leave the 12v battery with it when storing it. I bring it home and keep it on charger to have it ready for trips. My slide out works with the 7 round connector plugged into truck and I also thought the power jack did too. The other day I found out differently. It appears that I must have the battery hooked up for it to work. I checked the inline fuse and it was good, the only wire from jack goes to the battery. Does this sound like the way most electric jacks are wired? I will be checking with the dealer, but thought I'd ask here.
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Old 05-14-2012, 09:07 AM   #2
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That's how mine is, one wire to the battery. There should be a manual crank option if needed too.
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Old 05-14-2012, 10:25 AM   #3
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The jack is grounded to the A frame so a second wire is not needed... if you are having corrosion problems you can run a negative wire from the frame mounting bolt to the - of the battery...
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Old 05-14-2012, 10:25 AM   #4
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The tongue jacks actually run off the battery, not from the tow vehicle. I have been using utility trailers for years with electric jacks.
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Old 05-14-2012, 12:24 PM   #5
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Electric Tongue Jack

Thanks everyone for their answers. You just confirmed what the dealer told me. It sounded like it will work if the battery is low or dead if the 7 round plug is connected to the truck.
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Old 05-14-2012, 06:25 PM   #6
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Well my guess is the jack would pull more power than your 7 pin would want to provide - especially under load. You do have the option of using the manual crank with the jack if needed when you do not have a battery.
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Old 05-14-2012, 07:00 PM   #7
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you might also consider placing a zip lock baggie over it if you store it for extended periods of time.
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Old 05-14-2012, 07:38 PM   #8
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Quote:
Originally Posted by wb2nco View Post
you might also consider placing a zip lock baggie over it if you store it for extended periods of time.

We use a small plastic garbage can. It's the size of one you would use in a bathroom.
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Old 05-14-2012, 08:03 PM   #9
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I have powered the jack from the 7 pin when the battery has been too low to operate the unit. The trailer was at the dealer's lot for some repair. They did not disconnect the battery when they finished. By the time I picked up the trailer the battery was discharged. Plugging in the 7 pin allowed me to use the power jack.
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Old 05-14-2012, 08:28 PM   #10
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My electric tongue jack is not wired to the battery, it came with a 7pin connector wired to jack. I plug it into TV for power, then unplug it and connect 7pin trailer wires to TV for traveling.
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