How to Turn Off 12-V Power Feed to 7-Way Trailer Connector on Vehicle When Ignition is Shut Off

Question

Question:

If I leave my trailer connected to the truck while it is not running it drains the battery. I placed a meter on the 7 point connection and it appears the 12 volt pin is hot at all times. How does one fix this without tearing out the dashboard?

asked by: Ryan

0

Expert Reply:

This is very easily fixed. Simply install a battery isolation solenoid, part # PK5231201. This will disable that 12-Volt feed when the ignition is shut off. The solenoid is usually mounted in the engine compartment.

The product description overview video I've linked will run you through how to wire the solenoid. The terminal on either side is used for the incoming and outgoing power it doesn't matter which terminal is used for which and the center terminal is used to an ignition switched circuit. The radio circuit is often used, because it typically powers down when the ignition is off.

expert reply by: Mike L

0

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Answer 1

In regards to the Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps part #C57674, the 12 volt power circuit (black wire) will remain active at all times if connected directly to the battery. That said, the LED on the trailer connector doesn't draw…

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Answer 2

There are a few differences between the Universal Installation Kit part #ETBC7 and the 7-Way RV Upgrade Kit part #ETBC7L. The biggest one is that part #ETBC7 comes with both the power and brake output wire you will need to run to the cab/battery…

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Answer 3

It might be the tester. If the tester uses LED lights and it is a powered harness there can be some bleed off from the harness. This is normal and since LED lights require such little power draw they would light up a little. If you are using Curt…

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Answer 4

If you wanted to make your 12 volt power circuit turn off when the vehicle is turned off you could install the isolation solenoid part #PK5231201 on the circuit. You'd need install the circuit to the outside posts and then for the center pin…

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Answer 5

You will need a battery isolator, like Battery Isolation Solenoid, part #PK5231201, if you plan on leaving the trailer connected to the truck when the truck is off. If you unplug the 7-Way, the trailer battery cannot drain the truck battery. If you…

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Answer 6

On GM vehicles of that vintage, the 12-V pin should be hot regardless of whether the ignition is on or not. If it isn't showing voltage even with the ignition on, you're almost certainly on the right track thinking it's a blown or…

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Answer 7

Hello Andrew, Well that sounds like quite the fun trip, what state or states will you be traveling through? You're asking a really important question, especially since you're planning a cross-country trip with about 250 pounds of bikes and…

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Answer 8

When connecting two batteries together on an RV trailer you usually connect the batteries in parallel to draw 12 volts from both of the batteries. We have a photo, see photo at right, that shows how to wire the batteries in parallel. Once you have…

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Answer 9

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 10

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 11

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 12

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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How to Turn Off 12-V Power Feed to 7-Way Trailer Connector on Vehicle When Ignition is Shut Off

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