Does 12V Pin on 7-way Trailer Connector Always Have Power

Question

Question:

Is the + side of my 7 way trailer connector always powered

asked by: Bill P

1

Helpful Expert Reply:

It sounds like you're asking about the 12V circuit on the 7-way trailer connector on the rear of your 2003 Chevrolet Trailblazer. Some vehicles will always have power and some others will not. We don't have this specific information for your vehicle, but to determine if your 12V always has power you can test the pin in the 1 O'clock position on your 7-way.

The other pins will have power when the corresponding light is used or the brake pedal is pressed.

expert reply by: Charles S

1

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James P.

8/5/2020

My F-250 doesn’t have constant 12v to the trailer plugin. How can I get a constant 12 volts?

Reply

Chris R.

8/15/2020

If you want to have constant 12V power to the trailer, even when the truck's ignition is off, you can simply manually run your own hot lead. To do this run a length of 10 gauge wiring # 10-1-1 from the 12V pin on the 7-Way up to the battery's positive post via a circuit breaker like # 9510.

Reply

Answer 1

The only pin that should be continuously showing 12V power on the 7-Way connector on your vehicle is the 12V power circuit which is normally the black wire but not always. In 7-way wiring the 12V auxiliary power feed is carried on the contact at…

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Answer 2

The auxiliary 12-volt wire that runs from the 7-way connection to 7-way trailer plug will supply 12-volt power from the vehicle to the trailer. The 12 -volt power will allow interior or exterior lights to run that are not wired in to the…

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Answer 3

The light that indicates that the 12 volt circuit is hot is normal and it will not drain the battery. Think of it as the battery having a really long positive terminal that just extends to the rear of the vehicle. If nothing is drawing power from it,…

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Answer 4

You would not be able to charge your battery through the wiring on your 4-way trailer connector. Since your truck has a 7-way connector, you could maintain the power to the battery but not charge it. To begin, you would need to cut off your 4-way…

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Answer 5

Since you are not getting the 12V power when your truck is running, you most likely don't have a fuse issue as you stated their isn't a specified fuse or relay in the owners manual. The issue is that your truck is computerized even at the…

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Answer 6

The 12V wire at the vehicle-end trailer connector being hot even when the truck is off can vary depending on the application. For all aftermarket hardwiring installations of a 7-Way wiring harness, the 12V wire will be hot at all times, even when the…

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Answer 7

The Battery Isolation Solenoid #PK5231201 that you referenced can be used to charge a battery if needed. Normally this solenoid is used to allow you to allow a circuit to only be active when the vehicle's key is turned on. Basically you wire up…

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Answer 8

You are going to have to remove your current A-frame jack and replace it with one that does have a motor as there isn't a way to add motors to jacks that don't currently have them. I think the best value for an A-frame tongue jack is the…

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Answer 9

The Stromberg Carlson Electric Trailer Jack #SC63VR you were looking at has mounting holes that are 3" apart on center. This is the standard mounting hole pattern used by virtually all a-frame trailer jacks, so it will be an exact replacement…

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Answer 10

Although wiring an electric jack like the etrailer.com #EJ-3520-BBX you referenced to a dedicated battery on the trailer is the preferred solution for ensuring you get the needed power, you can indeed wire it to a 7-Way plug like #A7WCB for it to be…

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Answer 11

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 12

The grommet that you will want to use to install the Optronics Miro-Flex #STL35RB is the Optronics part #A33GB. For a pigtail you have 2 different options. The 3-Wire Pigtail for Optronics Trailer Lights part #A45PB has a straight connector and the…

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Does 12V Pin on 7-way Trailer Connector Always Have Power

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