Troubleshooting No Power At The Factory Trailer Plug

Question

Question:

I checked my fuse box and everything is okay but still no power at the plug.

asked by: Jack

0

Expert Reply:

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 check your grounding connections. Make sure your grounds are firmly connected to a clean, bare metal surface.

Next, test the pins on the connector where the wiring harness plugs into the truck using a circuit tester like Item # PTW2992. This will tell you if the problem is on the wiring harness or somewhere deeper in the truck's wiring. If everything checks out with the pins, then the problem is on the harness, and it can be replaced with Item # 30955. If you are not showing power on that connector then you have a wiring issue somewhere in the truck that needs to be tracked down by inspecting the wiring and seeing if you have something pinched, broken, or disconnected.

If still having issues, let me know and we can keep troubleshooting until we find it.

I have attached additional information that might help.

expert reply by: Brint H

0

Chris C.

4/30/2020

All my fuses are good and still no power to trailer connector or to brake controller on my 2002 Silverado HD.

Reply

Chris R.

5/1/2020

If the fuses (and relays) are all good, then there has to be something with the factory wiring that's cutting off power. Inspect the 7-Way at the bumper for any corrosion built up inside the pins, cleaning out as needed, and try to check any wiring you can gain access to to see if there are any damaged or exposed portions that need to be replaced.

Reply

Chris C.

5/6/2020

@ChrisR I replaced all the fuses that have to do with the brake system and disconnected the brake controller, i checked with a tester the wires going into the plug and no power, there has to be a relay or other fuse somewhere that i cant see, your replacement plug is way different than my factory plug

Reply

Chris R.

5/7/2020

If you aren't getting any power on the wires going into the connector, then the connector itself isn't the issue. There's something going on with the factory trailer wiring. Since all the fuses are good there's likely a short somewhere on the wiring. Troubleshooting this type of issue will be pretty difficult on your own since the factory wires are going to be hidden - I would honestly take the truck up to a local Chevy dealer to have them take a look.

Reply

Chris C.

5/1/2020

I cleaned the connector going to try disconnect the brake controller then thought about buying your 7 way connector next

Reply

Chris R.

5/4/2020

Let me know what you find when disconnecting the controller. You could test the wiring just behind the existing 7-Way as well. If you don't get power on those wires either then you'll know that the connector itself isn't the problem.

Reply

Chris C.

5/4/2020

I will try that and let you know in a few days

Reply

Chris R.

5/6/2020

Sounds good. Just let me know!

Reply

Richard

6/1/2024

I had power to my plug until I stuck a test light in there and I accidentally hit the ground in the hot and blew a fuse or change the fuse and I still got no power back

Reply

Bud M.

6/1/2024

@Richard Sorry I am confused. You said you had power and when you put the test light in to check blew a fuse, replaced the fuse and you still do not have power. If this is correct you may have also damaged a relay or the wiring somewhere on the harness. If you mean the trailer still does not show power that tells me the trailer connecter is either damaged at the connector or in the wiring up to the junction box. Please let me know.

Reply

Answer 1

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 2

You need to use the following calculation to find if you have enough clearance: (A + B) - C = Clearance A = Distance from the gooseneck ball to the truck cab B = Offset used C = Width of the nose of the trailer divided by 2. So your A is 35" and…

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Answer 3

The Optronics 7-Pole Blade to 5-Pole Flat Connector Wired Trailer Adapter - Coiled Cable - 94-1/2" Long #A57CCB will work with your trailer wiring. The 5-way on your trailer will have the reverse light power that will on the trailer connection…

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Answer 4

Your 2007 Hummer H3 should have four or five blunt cut wires under the left side of the instrument panel to the left of the steering column. You should see a bundle that contains a red wire with a black stripe, a white wire, light blue wire with a…

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Answer 5

For starters, I would first check to see that you are testing the correct pin. The correct pin that should house the 12-volt circuit on your 2017 Ram 1500's 7-way trailer receptacle is located in the 1 o'clock position (see photo). The…

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Answer 6

The Curt #C59236 wiring you've found for your 2024 Mazda CX-90 is a universal wiring kit that essentially fits any vehicle on the market since it requires splicing into the OEM wiring of the vehicle for the installation. The Curt 56494, which is…

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Answer 7

If you have a trailer wiring harness that's putting out voltage on all of the pins all of the time it does have an internal problem and need to be replaced. The converter boxes of the wiring harnesses are designed to "sacrifice…

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Answer 8

I have run into many issues with the trailer lights on a 2011 Toyota Highlander. In most cases, the wrong harness is purchased and it does not come with the converter section. The converter section cannot be purchased separately so I recommend the…

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Answer 9

Hi Stuart, Are you referring to the brake assembly mounting flange? If so you would need to have a qualified welder with the correct jig to hold the brake flange in place and weld it. This is typically more costly than just replacing the axle because…

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Answer 10

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 11

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 12

The factory hitch on your vehicle is integrated into the factory bumper mounting brackets, so removing the OEM hitch will result in losing your bumper. My contact at Curt tells me that he also had an early 2000's F-150, and he ended up having to…

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Troubleshooting No Power At The Factory Trailer Plug

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