
Trailer tongue jacks are used to lift and lower the front of a trailer, allowing users to connect and disconnect it from a tow vehicle. Manual jacks are typically raised and lowered with a hand crank, while electric jacks are operated by a switch. Electric jacks can be connected either by locating the electrical joint under the trailer tongue or by connecting it directly to the battery. To install an electric jack, users must first disconnect the trailer battery's ground cable and remove the old jack. The paint surface around the A-frame's bolt holes should then be scraped until the internal metal is exposed, ensuring a good ground connection. Finally, the electric jack can be placed into the existing hole and secured with bolts and washers.
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What You'll Learn

Tongue jack installation
An electric tongue jack is used to lift and lower the front of a trailer, making it easier to connect and disconnect from a tow vehicle. Tongue jacks can be manual or electric. Manual jacks use a hand crank to raise and lower the tongue, while electric jacks are operated by a switch, either on the jack itself or via remote control.
If you are installing an electric tongue jack, the first step is to remove the old jack from the trailer. This is done by simply unscrewing the mounting bolts. If the bolts are rusty, you may need to use a rust penetrant to loosen them. Once the old jack is removed, place the new electric jack into the existing hole, ensuring that the jack controls are pointing outwardly. Use a socket set to secure the jack in place with the included star washers. These washers provide a neutral earth connection for the jack.
A second support plate must also be installed under the tongue jack to prevent it from turning sideways on uneven ground. Most modern trailers will already have this plate installed, but if yours does not, you will need to have one made and welded in place.
To connect the electric tongue jack to the trailer's electrical system, locate the electrical joint under the trailer tongue. If your jack has double open wires, you will need to crimp on an eyelet terminal by the battery. The wires are typically 10-12 gauges, and the eyelets are usually 5/16 inches in diameter. Ensure that the hot wires and ground wires are connected to their correct counterparts.
Once the jack is physically installed and connected to the electrical system, turn on the power to the jack. There should be a button on the jack to do this. If the jack's foot can be moved upward and downward using the up/down button, then the installation is successful.
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Electric tongue jack operation
Electric tongue jacks are used to lift and lower the front of a trailer, allowing users to connect and disconnect it from a tow vehicle. They can be operated using a switch, which may be located on the jack itself or on a remote control. This makes the process of hitching and unhitching a trailer smoother and more efficient compared to manual methods.
To install an electric tongue jack, first remove the old jack from an A-frame trailer by unscrewing the mounting bolts. If the bolts are rusty, a rust penetrant may be required to loosen them. Next, place the electric tongue jack into the existing hole, ensuring that the jack controls are pointing outwardly. Secure it in place using a socket set and the included star washers, which also provide the neutral earth connection for the jack.
For electric tongue jacks with a 7-way plug, the mounting process is complete at this point. However, if the jack has double open wires, an eyelet terminal must be crimped on by the battery. The wires are typically 10-12 gauges, and the eyelets are usually 5/16 inches in diameter. Connect the wires to the electrical joint under the trailer tongue or directly to the battery, ensuring that hot wires connect to hot wires and ground wires to ground wires.
Once the electric tongue jack is installed, turn on the power by pressing the button on the jack. Test the operation by using the up/down button to move the jack's foot upward and downward. If the jack stops working, it could be due to a power outage or a clog. To resolve this, pull and twist the small valve on the side of the jack to release pressure, then insert a tool, such as a pipe, into the jack's handle to manually raise or lower it. Modern jacks may also have a manual override cap, where removing a rubber stopper reveals a nut that can be turned with a crank handle to extend or retract the jack.
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Troubleshooting
Firstly, check that the power is turned on. Most tongue jacks have a light that displays when there is power to the unit. If the light does not come on, there could be an issue with the power supply or the light itself. Check that the switch is in the ON position and that the power source is functioning.
If the jack is not operating correctly, it may be clogged or there may have been a power outage. On older models, there is often a small valve on the side of the jack. Pull and twist this valve to relieve pressure and allow for manual operation. Modern jacks often have a manual override cap, which can be accessed by removing a small rubber stopper on top of the jack.
If your jack is not raising or lowering, the motor may be trying to draw more amperage than it can manage, or the ground may be bad. Check your ground wire to ensure it is connected securely to a clean metal surface. If it is an A-frame jack, it may ground through the mounting hardware, so check the ground from the trailer wiring connector that runs to the trailer frame. Ensure there is no rust or paint where the washer contacts the trailer frame and the jack for a good connection.
If your jack is still not working, it may be an issue with the motor or a bad switch. You can test for power by using a circuit tester to test your power wire before and after your switch, and then at the motor. You can also check for an in-line fuse that could be bad. If there is no short in the wire and the switch is not bad, you may have a faulty motor.
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Safety considerations
Trailer tongue jacks are essential for lifting and levelling trailers, making it crucial to choose the right one and ensure it is correctly installed and maintained. Safety should be a top priority when connecting a tongue jack to an electric trailer. Here are some critical safety considerations to keep in mind:
Weight Capacity:
Before selecting a tongue jack, determine your trailer's tongue weight, which is typically 10-15% of the trailer's total weight. It is important to choose a jack that can handle the weight of your trailer tongue. Using a jack with insufficient weight capacity can lead to failure and dangerous situations.
Interference with Trailer Hitch:
In some truck models, limited hitch space or taller tailgates may cause the electric tongue jack to interfere with the trailer hitch's operation. Ensure that the jack is positioned correctly and does not obstruct the hitching process.
Secure Connections:
When connecting the electric tongue jack, ensure that the right cables are connected to the correct locations. Hotwires should be connected to hotwires, and ground wires to ground wires. Improper connections can lead to electrical issues or malfunctions.
Support Plate:
A second support plate under the tongue jack is crucial for stability, especially on uneven ground. Without this plate, the jack may turn sideways, causing potential damage or injury. Ensure your trailer has this support plate installed, and if not, have one made and welded in place before using the electric tongue jack.
Manual Override:
Familiarize yourself with the manual override procedure in case of power outages or jack malfunctions. Know how to access the manual override cap, use a crank handle, and operate the jack manually. This knowledge will help you safely handle unexpected situations.
Battery Considerations:
Electric tongue jacks draw power from the battery to operate. Ensure your battery is in good condition and can handle the power draw. A weak or faulty battery may not provide sufficient power, impacting the jack's performance and your ability to hitch and unhitch the trailer safely.
By following these safety considerations, you can help ensure a secure and efficient connection between the tongue jack and your electric trailer, reducing the risk of accidents or equipment failure. Remember always to refer to your trailer owner's manual for specific guidelines and weight ratings.
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Tongue jack maintenance
An electric tongue jack is used to lift and lower the front of a trailer, allowing users to connect and disconnect it from a tow vehicle. While electric tongue jacks are convenient, they are prone to failure. Therefore, regular maintenance is required to keep them in good working condition.
Troubleshooting a Non-Functioning Tongue Jack
If your tongue jack is not functioning, there are a few things you can check before taking your vehicle to a service centre. Firstly, ensure that the tongue jack is receiving power by turning it on and checking if its power light is illuminated. If the light is on but the jack is still not working, there may be an issue with power distribution. Try plugging your trailer's 7-pin connector into your tow vehicle and starting the engine to pull power from the alternator. If the jack works with this method, the issue may lie with the battery or converter.
Maintenance Tips
Some tongue jacks, like the LCI model, are lifetime lubricated and require little to no maintenance. However, for most tongue jacks, regular lubrication is necessary to keep them functioning smoothly. One method is to pour a cup of used motor oil into the jack after removing the plastic cap. This will keep the jack functioning smoothly for a few years. If you encounter squeaking, greasing the shaft and crank handle area may resolve the issue.
Replacement
If your tongue jack is beyond repair, you may need to replace it. Trailer jack replacement is usually straightforward, requiring the removal of the mounting bolts. If the bolts are rusty, a rust penetrant may be needed to loosen them. After removing the old jack, install the new electric tongue jack into the existing hole, ensuring the jack controls face outward. Secure it in place using a socket set and star washers, which provide a neutral earth connection. Finally, install a second support plate under the tongue jack to prevent it from turning sideways on uneven ground.
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Frequently asked questions
A trailer tongue jack is used to lift and lower the front of your trailer, allowing you to connect and disconnect it to/from your tow vehicle.
To install an electric tongue jack, first, park your RV, hitch it to the tow vehicle, and set the parking brake. Then, disconnect the trailer battery's ground cable. Next, remove the old jack by unscrewing its securing bolts. Finally, place the new electric tongue jack into the existing hole, ensuring the jack controls are pointing outward. Secure it with mounting bolts and washers, and install a second support plate under the tongue jack if needed.
Electric tongue jacks are typically operated by a switch, which can be located on the jack itself or on a remote control. Simply push the button to raise or lower your trailer automatically.
Electric tongue jacks are much easier to use than manual jacks, which require strenuous manual cranking. They save time and energy, offer adjustable heights, and improve safety with features like LED lights and built-in circuit breakers. Electric jacks also allow for a more precise and efficient hitching process, reducing the risk of dangerous situations.









































