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.

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.

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

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.

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

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.

Chris C.

5/4/2020

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

Chris R.

5/6/2020

Sounds good. Just let me know!

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

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.

Art

9/17/2025

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

Answer 1

LED type lighting is a great way to update your trailer to both increase light output and reduce power demands on your tow vehicle's wiring. LEDs use about 1/10th the power of standard incandescent bulbs and they do not require periodic bulb…

view full answer...

Answer 2

John, I do believe we have something for you, but without any dimensions of the center cap it's going to be a bit difficult to say for sure, but from the looks of it the Trailer Wheel Center Cap Plug #AM90082 looks like it'll work. This…

view full answer...

Answer 3

Hey Dan! I wasn't able to pull anything off of the 140050 part number you gave me. If you could pull one of your other caps and get me the diameter I would be happy to see if we have one that will work. Just comment below once you get the…

view full answer...

Answer 4

First you will need to remove the old hydraulic equipment. Remove the surge coupler or actuator, remove all the lines, and finally remove the brake assemblies. If you have 10 inch diameter hub and drums, you may need to replace those as well. If you…

view full answer...

Answer 5

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…

view full answer...

Answer 6

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…

view full answer...

Answer 7

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.

view full answer...

Answer 8

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…

view full answer...

Answer 9

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…

view full answer...

Answer 10

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…

view full answer...

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…

view full answer...

Answer 12

You are correct, all someone would need to do is cut the metal rods you pointed out to be able to slide the sleeve back of the coupler. Because of that you might be more interested in a Demco Coupler #DM13203-95 which uses a much more concealed latch…

view full answer...

Troubleshooting No Power At The Factory Trailer Plug

Products Featured in This Question

Featured Help Information

Miscellaneous Media

Continue Researching