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

Art

9/17/2025

Trailer plug(7 point) works on the bumper plug in but not in truck bed. Both outlets have been tested

Reply

Answer 1

Hey Luke, yes this is typically indicative of a problem with the Curt trailer wiring harness you installed. To test this for sure you would want to use a circuit tester like the part #PTW2993 to test for voltage on the input side of the converter box…

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Answer 2

Since wire color codes are NOT universal, we always recommend wiring by function, rather than wire color. If you look at the Trailer Wiring FAQ article I have linked you to, you can see some diagrams showing the proper way to wire a vehicle and…

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Answer 3

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 4

The best way to attach safety cables like #RM-643 would be to use safety cable extensions like #RM-910648-20 and loop them around the frame members just behind the bumper. This is confirmed by Roadmaster.

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Answer 5

We do have replacement 7-way connectors for your 2006 Ford F-350 Super Duty, though I'm not 100 percent certain what are are referring to in terms of also wanting a pigtail. What I recommend is replacing your 7-way with the Curt T-Connector…

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Answer 6

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 7

From what I'm seeing, the manual transmission models of the 2007 Subaru Forester can be flat towed and a complete flat towing setup consists of base plates, a compatible tow bar, safety cables, tow bar wiring, supplemental braking and possibly a…

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Answer 8

To replace the 10K Hybrid safety cables that came with your Roadmaster Nighthawk tow bar you'll need the kit #RM-674 which comes with 2 of these cables. These are the same design as your current setup and they come with a limited lifetime…

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Answer 9

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 10

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 11

Both the Tow Ready #TR118821 and the Hopkins #HM56300 serve the same purpose, allowing the lights on your flat towed vehicle to operate in tandem with those of the the RV. The difference is that the Hopkins wiring harness is a plug and play…

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Answer 12

Yes, I will be happy to tell you what you will need to flat tow your 2007 Honda CR-V behind your motorhome. There are 5 major components needed: base plates, tow bar, safety cables, lighting, and supplemental braking. For base plates I recommend…

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Troubleshooting No Power At The Factory Trailer Plug

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