Troubleshooting No Trailer Connection Message on Tekonsha P3

Question

Question:

I have everything hooked up and my trailer plugged in but it say on my screen that no trailer is connected. My tester is showing a dim light from the blue wire. Any suggestions? Could this be a grounding issue?

asked by: Tyler B

0

Expert Reply:

I would start by inspecting the connection on both your vehicle and trailer. This issue is often caused by corrosion on the 7-way connections. It probably wouldn't hurt to clean the connections one way or another.

If this does not solve the problem then we will move on to wiring. I would check all of the brake controller connections and make sure they are good. If you had a plug-in connection try unplugging it and plugging it back in to make sure it is seated firmly. This would also be the time to check the ground connection. If you aren't sure about it, you may want to try moving it to see if it solves the problem.

Once this is done I would move on to testing the wires. Since I don't know where you checked the wire at, start by testing the blue wire behind the brake controller. If no power is present it may be that the controller is malfunctioning. If there are no issues move back to the 7-way connection on the vehicle. If this is where you tested originally and found low or no power, you will need to inspect the wire for a short. If there is no issue at the vehicle 7-way you want to continue to test, working your way back toward the magnets.

I have attached some helpful articles that go over troubleshooting brake controllers in greater detail for your reference. If you are unable to locate the problem please reach out and I will help you troubleshoot further.

expert reply by: Robin H

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Answer 1

If your Tekonsha P3 Brake Controller, part #90195, displays the error message OUTPUT SHORTED NO BRAKES, the potential causes are a short in the brake output circuit somewhere between the brake controller and the trailer brake assemblies, or a shorted…

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Answer 2

The "Warning Output Shorted No Brakes" error message on the Tekonsha Prodigy P3 Trailer Brake Controller part #90195 per the manual can be caused by one of two things. I have listed these for you below: 1. Detects brake output wire shorted…

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Answer 3

I would start by inspecting the connector on your trailer and the vehicle to make sure there is not corrosion in the connector which could be causing a bad or weak connection. If there is corrosion in the trailer side connector, you would need to…

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Answer 4

It does sound like there is a possible short with the brake magnets on your trailer, especially if all the wiring looks good between the brake controller and vehicle connector. I recommend first making sure that each magnet has one wire secured to…

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Answer 5

If you sever the blue wire leaving the P3 controller part #90195 leaving enough room to reconnect it and test the end of the wire leaving the controller with a circuit tester like part #PTW2993 you should see voltage when you slide the manual…

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Answer 6

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 7

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 8

The best brake controller option to go with is one that activates the brakes proportionally instead of time delayed. A proportional brake controller will activate the trailer brakes at the same time and with the same intensity as the tow vehicle…

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Answer 9

The trailer brakes work on a separate circuit than the lights. You have a couple of options to control the electric brakes on the trailer. One option is to use an air over electric brake control, #HA100400C. This unit connects to the air brakes on…

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Answer 10

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 11

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 12

You are correct, you should only be getting output when the brake is applied, or the override switch is activated. It sounds like the controller might be bad, but to make sure, you should probably bench test it before tossing it. Use a circuit…

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Troubleshooting No Trailer Connection Message on Tekonsha P3

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