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How To Install An Electric Tongue Jack On A Trailer

Electric trailer tongue jacks are really easy to install and a huge upgrade from manual hand crank jacks. They can save you a lot of work and most even come with LED lights installed to help you when hitching and unhitching at night. If you live in your trailer full time or have a work trailer that you hitch and unhitch all the time getting an electric jack is going to make life easier.

Step 1: Buy the Correct Size of Power Jack

Installing a new power jack for your trailer should be a simple process if you have bought the right size. The standard tube diameter for a-frame trailer jacks is 2.25 inches. All of the power jacks on my best electric tongue jacks for trailers have that diameter. If it’s a special size you may need to order a custom electric jack.

The outer tube of the jack is 2.25 inches which is the standard

You can buy power trailer jacks for tongue weights from 3,500 to 5,000 pounds, which means there’s an electric jack for almost any size and weight of bumper pull trailer. Safe tongue weights are no more than 15% of your gross trailer weight (GTW). That means even the lightest-duty power trailer jack (3,500lbs) can take GTW of up to 23,333 lbs. My 31-foot travel trailer has a max GTW of 9,000 which means a 3,500 lbs electric tongue jack is more than enough.

To measure your trailer’s tongue weight so you know if you have it loaded down safely you can get a trailer tongue weight scale or use a do it yourself method using only a bathroom scale. This method only works on a lighter trailer. If you have a heavy-duty work trailer you will have to buy a scale.

Step 2: Remove The Old Jack

Removing a jack on an a-frame trailer is easy. Just remove the 3 bolts on the mounting plate of the jack.

The new electric tongue jacks holes should line up with the old one.

Step 3: Bolt In The New Electric Jack

Once the old jack is removed just line up the electric jacks mounting plate with holes already in your trailers A-frame. Make sure the power jacks electrical housing is facing forward.

Step 4: Electrical

If your jack is powered by a 7-way plug you are now done with the installation process. If your jack just has two open wires you will need to crimp on a battery eyelet terminal. The wire is normally 10-12 gauge and the eyelet should have a 5/16 stud hole. Because these connectors can be out in the elements getting an eyelet terminal with heat shrink as well is a good idea. A pack like this one will have everything you need to make a good connection for your electric jack.

Once you’ve installed the eyelets you can either connect your electrical tongue jack directly to your battery or you can connect it to the electrical junction usually located under the tongue of the trailer. It should look like this.

 

Electrical junction located on tongue of the trailer

To connect just lift one of the red rubber protectors and bolt in your cables. Make sure you connect the right wires to the right spot. Grounding wire to grounding wire, hot wire to hot wire.

Once you’ve got it connected you should be able to turn on the power using a switch located on the jack. If you can move the jack up and down using the up/down switch you are good to go.

Have any questions about installing an electric trailer jack? Leave a comment.

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