Wiring An Electric Trailer Tongue Jack Into 7-Way Vehicle Trailer Connector

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Question:

i have a 16 foot flat deck open car hauler which is running a 7 pin connector due to the electric brakes. i am replacing the hand crank A frame tongue jack with an electric tongue jack without a battery on the trailer. hopefully is there a method to toe into teh existing trailer 7 pin wiring so that when the trailer is plugged into the truck it powers the jack. Thanks in advance

asked by: Earl S

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Expert Reply:

Electric tongue jacks like the Electric Jack w/ Footplate - A-Frame - 25-1/8" Lift - 3.5K - Black # EJ-3520-BBX are designed to use a 12v power so if you want constant power I recommend using a trailer battery for connection. If you only want power when connected to your vehicle 7-way, you can use the Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End # PK12706 to connect to the 12v Pin.

expert reply by: Jason S

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Jody

4/27/2024

Can you do the same thing with a 4 pin trailer plug? Thank you in advance

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Kevin C.

5/17/2024

@Jody A 4-pole trailer connector only has light functions and ground and wouldn't have the necessary 12v power for the trailer jack. If you can tell me the year/make/model of your vehicle I could find the parts needed to get you a 7-way.

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Jody

6/21/2024

@KevinC Thanks Kevin, it's a 2021 chevy silverado trail boss 1500

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Kevin C.

6/21/2024

@Jody If you have a 2021 Chevy Silverado 1500 you should already have a 7-way connector on the truck. For the trailer side you'll need a 7-way cable # A10-7W8 and a junction box # 3375601101. The junction box can be mounted on the trailer tongue and will be the connection point for the cable and the wiring already on your trailer. The trailer jack can be ran to the 12v auxiliary power post in the junction box so that it's powered by the tow vehicle when connected.

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See All (4) Replies to Jody ∨

J.c.

1/7/2025

I think I have a similar situation. I have a 36 foot basic car hauler that our church uses for storage each week. I am replacing the manual jack with a power one and the unit comes with a black and red power cables just kind dangling off to the side. I don’t want to have an external battery, I want to plug up to the truck via 7 pin while using and that’s it. Is this the same 7 pin connector I would need to get and would I just attach the red to red and black to black on the 7 pin connector or something different?? Thanks!

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Kate F.

1/7/2025

@Jc Who wants an extra battery if you don't need one? You can most definitely hook it up to the 7 way so you can power if from you trucks battery. You will want to double check the instruction manual to your jack, but the black should be your power and the red should be your ground (if you would like, let me know what jack you have and I will make sure). You will want to connect the power wire to the to the power portion on the # PK12706, and then you can ground the red wire straight to the frame of the trailer, or to the ground portion of the # PK12706 . I would also install a 30 amp. In-Line Circuit Breaker # 38630 close to the connector to save the jack from any power surges, you could also use a 30A in-line fuse, we only have them in 40A which is not recommended, but it would be like part # SWC9539. That is awfully nice of you to let your church use your car hauler for storage. May you have a Blessed 2025!

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Answer 1

For a 3500 lb Electric Jack, I recommend the Bulldog Powered-Drive Trailer Jack - Drop Leg - A-Frame - 14" Lift - 3,500 lbs - Black #BD500187. This jack uses a 12 volt system, so it is compatible with your 7-way although a battery is always a…

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Answer 2

Hey Reginald, We do in fact have the manual for that jack! I am getting it added to the website but will go ahead and attach and image of it for you below. Was there anything specific you were wanting to know about the jack?

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Answer 3

Hello Brian, thanks for reaching out. That would be fine. There is really no need for a cut-off switch here but there is no reason why you can't use one. As long as the jack is connected to a 12v power source, it will operate as intended.

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Answer 4

Hey Geoff! How do you like it so far? The wire on the #e23ZV is 12 gauge. You can add a fuse if you want but it isn't necessary since the jack has a 20A automatic reset fuse built in already. If you want to add one I would make it the same 20A.

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Answer 5

Hey Joe, while I don't know what brake controller you have you should be able to unplug it from the back of the brake controller and that would accomplish what you are wanting. What brake controller do you have?

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Answer 6

Yes, about 99 percent of A-frame jacks use the same mounting pattern. The holes are generally 3 inches apart on center though it can vary ever so slightly which is why some jacks have slotted holes.

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Answer 7

Hi Nick; the Dexter Self-Contained Hydraulic Jack #DX72CR can be bolted onto your dump trailer. The only other thing you will need is a 12V battery to power the jack. This has a lift capacity of 10,000 lbs, a support capacity of 12,000 lbs, and comes…

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Answer 8

First, you need to make sure that your 2014 Mercedes ML350 is rated for use with weight distribution. The trailer hitch should have a sticker on it and it should show 2 tongue weight capacity ratings if the hitch is rated for weight distribution. The…

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Answer 9

The correct Reese under bed rail kit for a 2002 Silverado 2500HD is part #RP30061. With the pucks installed, you can then use a puck mounted hitch like the Reese Elite Series, part #RP30144 or the older Signature Series. Or, you could use an adapter…

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Answer 10

The easiest way to power your electric jack off of the 7-way and/or the battery is to install the Trailer Wiring Junction Box - 7 Terminals item #3375601100 and connect your jack to the 12v circuit that your battery would also be connected to. This…

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Answer 11

The 12V circuit from your truck's 7-Way isn't typically the best source to power a higher-rated accessory like the Fulton XLT Powered Drive Trailer Jack #F141401 that you referenced. You might be able to operate the jack in this manner but it…

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Answer 12

The Fulton #F141401 XLT Powered side-mount trailer jack has a lift capacity of 2500 lbs, so it will handle your trailer's 1100 lb tongue weight with no problem whatsoever. The jack draws 15 amps, and you'd want a battery that had a minimum…

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Wiring An Electric Trailer Tongue Jack Into 7-Way Vehicle Trailer Connector

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