Which Fuse Provides 12-Volts to 7-Way Connector on 2009 Chevy Silverado 3500 Diesel

Question

Question:

Which fuse control the 12v power on the 7 way plug on a 2009 3500hd Chevy diesel

asked by: Tony

1

Helpful Expert Reply:

If the 12-volt pin on your trailer connector isn't working, you've got a missing or blown fuse or the wiring connection at the fuse box under the hood wasn't finalized.

You're looking for a 40 amp fuse, located in position # 68 in the fuse box under the hood. The fuse protects one of the nearby power studs on the side of the fuse box, which is where the wire that provides power to the 7-way should be connected. If it's not, you can find the wire bundled up under the master cylinder (see photo). Simply uncoil the wire and attach it to the right hand stud on the fuse box.

expert reply by: Mike L

1

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Jim W.

2/28/2020

I have a 2008 gmc 2500hd diesel..my 7 way charge wire is dead..the wires under hood on the front of the fuse box are hot..all other circuits are working..will I have to run a new wire?

Reply

Chris R.

2/29/2020

If all your fuses are good (you can check your owner's manual for the 12V trailer charge fuse location) and wire connections under the hood are made then your best option would be just to run a new hot lead. This allows you to bypass the factory wiring which can be frustrating to troubleshoot and likely expensive to repair. Just run some 10 gauge wiring through a breaker from the positive post of the Sierra's battery to the 12V pin on the 7-Way and it'll be good as new.

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Answer 1

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…

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Answer 2

Sometimes the fuses are already installed from the factory, but if not the fuse slots are in the front of the box. I have attached a picture that shows the location of fuse slots. I have also linked a video installation of a brake controller on a…

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Answer 3

Yes, if you are looking to activate the 12V power function on your 7-Way connector, like the part #PK11916, then you may need to connect the 12V power wire to the front of the power distribution box. If you check out the attached photo you can see…

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Answer 4

Yes the max psi rating for the valve stem on the Aluminum Viking Series Valhalla Trailer Wheel part #AX02660655BMMFL is 80 psi. Which should be in line with the max psi of any tire that will fit on that wheel. If you have a special situation where…

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Answer 5

I reached out to Taskmaster and the valve stem on the Aluminum Viking Series Valhalla Trailer Wheel #TA75FR is rated for 80 psi. If you need a valve stem with a higher rating, I recommend the Americana Metal, Bolt-In Valve Stem #AM20906 which…

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Answer 6

In regards to the psi rating for a wheel/tire combo you would always need to abide by the lowest rated component, the tire, wheel, or valve stem. The tire should list the max psi on the sidewall but in order to find this information on the wheel…

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Answer 7

There are a few troubleshooting steps to help you figure out why you have no power. I would start by making sure that there is not any corrosion or debris blocking your connection points. If they are clean or still no power after cleaning, I would…

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Answer 8

Trailer fuses are found in the underhood fuse block. Fuse 1 is your trailer Right stop/turn lamp. Fuse 3 is your Left stop/turn lamp. Fuse 10 is your trailer backup lamps. Fuse 25 is your trailer park lamps. If you don't want to pull the…

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Answer 9

There may be some additional connections you need to make under the hood of your 2009 Chevy Silverado in order to make the 7-Way fully functional. I have included a link to an FAQ article that will help. If everything is connected properly and you…

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Answer 10

On a factory 7-Way connector the 12 volt hot wire should be the terminal at the 1 oclock position, looking at the front of the connector. If you test that terminal with a circuit tester and have no power you will want to check under the hood of your…

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Answer 11

Some trucks do need an under-the-hood connection of wiring to activate the 12V trailer power feed and the trailer brake controller power input feed. This process is outlined and illustrated in the linked article, in the section titled…

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Answer 12

I did not see where you listed the year, make, and model of your tow vehicle which I would need in order to confirm the fuse location (if present) but these are almost always listed in the owner's manual so that is where I recommend that you…

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Which Fuse Provides 12-Volts to 7-Way Connector on 2009 Chevy Silverado 3500 Diesel

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