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Parts Needed to Have 7-Way Socket on Trailer for Powering Electric Tongue Jack

Question:

Have a 12v powered trailer tongue jack. 7 pin cord from jack plugs into tow vehicle for power to run jack. Can this product be used by attaching pos and neg leads to trailer batteries then plug into 7 pin cord from jack? Then trailer batteries supply power to operate jack.

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Expert Reply:

It sounds like your trailer has a 7-way RV-style plug like # H20044 that is taking 12V power from the auxiliary trailer feed to power your jack. This means the power for the jack is coming from the vehicle battery. If your trailer has a battery or two and you prefer to power the jack from these instead, all you'd need to do is install a 7-way socket like # 30717 on the trailer.

You'll only need to make two wiring connection to have 12V battery power ready at the new socket.
Connect the white wire to the battery ground and the black wire, through a 40-amp breaker # PK54540, to the positive terminal. You will need ring terminals # 44-5356A to make the connections to the breaker and battery.

When you're towing the vehicle will send a maintenance charge to the trailer batteries to keep them topped off, but this 12V feed cannot charge a depleted battery. It can only keep a charged battery topped off. To charge a depleted battery you'll need a shore power charger like one of the CTEK units, such as # CTEK56353.

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Adam R

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