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Delano1981's avatar
Delano1981
Explorer
Apr 18, 2021

Electric Tongue Jack Power Problem

If anyone has any electrical experience, I have a problem with this electric tongue jack I purchased from eTrailer.com:

https://www.etrailer.com/Camper-Jacks/Buyers-Products/3370093500.html

It has a 7 pin plug like the standard plug on a trailer that you can plug into the truck for power. The problem is that the jack doesn't work when I plug it into the truck 7 pin connector, even though I have verified 12V power and ground is present on the correct pins of the truck connector. But, if I run a jumper wire from the positive post of my trailer battery to the correct 12V power pin on the jack 7 pin connector, it works perfectly. My guess is that it is not getting ground when plugged into the truck. Any ideas on what could be wrong?

Thanks
  • MFL's avatar
    MFL
    Nomad II
    Apr 18, 2021
    ScottG wrote:
    Sounds like you figured it out - the jack is using the trailer for ground and not the ground at the trucks 7 pin conn.
    Personally, I would cut the connector off and wire it to my trailers battery like most jacks are.


    Agree with Scott, it would be much nicer to have the jack wired to trailer battery. If you wanted to raise/lower the trailer front, it seems foolish, to have to connect to the truck to do so.

    Jerry
  • WNYBob's avatar
    WNYBob
    Explorer
    Apr 18, 2021
    Check your truck manual, I needed to add a fuse in the fuse box, it may be blown or not there.
  • ScottG's avatar
    ScottG
    Nomad
    Apr 18, 2021
    Sounds like you figured it out - the jack is using the trailer for ground and not the ground at the trucks 7 pin conn.
    Personally, I would cut the connector off and wire it to my trailers battery like most jacks are.

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