Hi, I have a couple of quick questions. I need to move my trailer a short distance in my yard. The trailer battery is out of the trailer and I am temporarily unable to physically reinstall it back into my trailer. I have a electric tongue jack and I want to use it to hook the trailer up to my truck. If I plug my 7 pin trailer cable into my truck hitch receptacle will I be able to operate the electric tongue jack without the trailer battery? In other words will the truck battery operate the trailer tongue jack? Will I cause any electrical damage to the trailer or truck if I do this? Thanks in advance.Ambrose

Interesting question. It was my understanding the 12 volt line is fused and relay activated. But that is on my 2011 F-150.Does your jack have a manual operating option?

My understanding is you can't as the hot 12 volt leads from the 7 pin connector are all dedicated to brakes, and lights.

The electric jack on my previous travel trailer was wired into the battery terminal directly with it's own fuse. If there was no battery, the jack wire was just dangling in air. If this is the case with your's in question, then you could jump the jack easily with a pair of jumper cables, which would run only the jack.Most electric jacks have a manual override. The rubber seal on the top pops off and then there is an end for a heavy duty Allen Wrench style jack to insert so it can manually be raised and lowered. At least mine did.Check it out, either one of these methods will work to operate the tongue jack.

Use the truck battery and booster cables to connect to the trailer battery cables.

Try it and see, mine will work off the 7 Pin with no battery.

Jacking & moving without installing trailer battery

Boon_Docker
Explorer III
Sep 08, 2019
Use the truck battery and booster cables to connect to the trailer battery cables.
DutchmenSport
Explorer
Sep 08, 2019
The electric jack on my previous travel trailer was wired into the battery terminal directly with it's own fuse. If there was no battery, the jack wire was just dangling in air. If this is the case with your's in question, then you could jump the jack easily with a pair of jumper cables, which would run only the jack.

Most electric jacks have a manual override. The rubber seal on the top pops off and then there is an end for a heavy duty Allen Wrench style jack to insert so it can manually be raised and lowered. At least mine did.

Check it out, either one of these methods will work to operate the tongue jack.
USAFBILL
Explorer
Sep 08, 2019
My understanding is you can't as the hot 12 volt leads from the 7 pin connector are all dedicated to brakes, and lights.
rbpru
Explorer II
Sep 08, 2019
Interesting question. It was my understanding the 12 volt line is fused and relay activated. But that is on my 2011 F-150.

Does your jack have a manual operating option?

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Jacking & moving without installing trailer battery

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