Fuse Location for 12-Volt Accessory Feed to 7-Way Trailer Connector on 2005 Chevy Silverado

Question

Question:

Is the 12v acc pin supposed to be hot all the time in the 1 oclock position on the 7 way of the tow vehicle? Im not getting any power on that pin at all. The truck is a 2005 chevy silverado 3500 SRW. Is there a fuse that powers that pin? The 7way was a plug and play into the rear chassis harness. All help is appreciated!! Thanks.

asked by: Shane M

0

Expert Reply:

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 possibly missing fuse.

The 12-v feed circuit to the trailer connector is protected by a 40A fuse located in the power distribution box mounted to the inside of the driver's side fender in the engine compartment. Remove the lid and the cover to the box, which should fully expose the fuse block. On the inboard side of the fuse block, there should be two threaded studs. Check the one closest to the front of the vehicle to see if there is a wire with a ring terminal attached to that stud and if there's a good orange 40A fuse installed in the adjacent location as shown in the provide photo. If the fuse is missing, install one or replace if blown.

If there isn't a wire connected, look between the fuse block and the fender or between the fuse block and the firewall. There should be a red wire with a ring terminal attached to it. You might need to carefully peel some of the tape off the nearby wiring harness to locate the wire. If you can't find a wire with a ring terminal, you'll need to run your own circuit back to the trailer connector. Use a length of 12-1-1 wire and a # 44-5356A ring terminal, attach to that post and run it back to the pin in the 1:00 position on the trailer connector.

expert reply by: Mike L

0

12V Accessory Fuse Location 1st Gen GM Silverado/Sierra
(click to enlarge)

Chris L.

6/25/2024

Is this the same for a 2500 HD Duramax as well. I also have 2 batteries under the hood

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Mike L.

6/27/2024

@ChrisL It should be. I'd recommend you check your owner's manual or the lid to the breaker box, which should have a fuse diagram to confirm.

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James B.

8/23/2024

I have a 2003 chevy 1 ton and my fuse box doesn't look like the one that's posted

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Mike L.

10/4/2024

@JamesB I looked up the owner's manual for the 2003 Sliverado, and what's shown in the diagram is pretty much the same as what's shown in the photo above. Look at the legend printed on the fuse box cover. You want the fuse that's referred to as 'STUD 1'.

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Answer 1

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…

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Answer 2

The pin in the 1:00 position on your 7-way is fed by the auxiliary power circuit. The wire feeding that circuit runs to the engine compartment and terminates under the brake booster and master cylinder and will have a ring terminal on the end of…

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Answer 3

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Answer 4

Yes there will be a fuse that protects the 12 volt trailer accessory circuit of your 7-way wiring. If this is factory wiring of a truck you'll want to check out the fuse box diagram or the owners manual.

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Answer 5

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Answer 6

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Answer 7

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Answer 9

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 10

It sounds like you're looking for the fuse that controls the 12v power to your 7 way connector. The fuse for the 12v power on a 2007 Chevy Silverado (New Body Style) is located at the front of the power distribution box under the hood of the…

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Answer 11

If you are looking for a power source for your brake controller, I do not recommend using a fuse tap. The brake controller's power needs to be ran through an appropriately sized circuit breaker and to the battery post. The installation…

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Answer 12

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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Fuse Location for 12-Volt Accessory Feed to 7-Way Trailer Connector on 2005 Chevy Silverado

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