P3 Brake Control Shows No Trailer Connected Even with Trailer Connected to 2002 Ford F-150

Question

Question:

I bought a tekonsha p3 and installed. When I hook up to a trailer that I know has good and working brakes, my brake box still says no trailer connection. Was wondering if you had any info on this? Would greatly appreciate it. The truck is a 2002 ford 150

asked by: Andrew W

0

Expert Reply:

A brake controller like the P3 # 90195 senses the brake magnets on the trailer when connected to the truck. It is possible that the blue wire (brake output wire from the controller to the trailer) is broken or missing somewhere so it cannot sense the trailer.

To test this, adjust the controller to the highest setting. Then have someone sit in the truck cab and fully apply the manual override lever while you test the brake output pin in the 7-Way connector at the back of the truck using a circuit tester such as # PTW2993 or a meter like # PT89ZR.

If there is no power when you do this test, then do the same test only check at the blue wire at the back of the controller. If you don't get power, there either then there is a problem inside the controller, and it will need to be replaced.

But if there is power at the back of the controller but not at the truck's trailer connector then the issue is likely a damaged wire somewhere between the controller and the connector at the back of the truck. Or you could run a new wire if you wanted to (if the wiring on the truck is difficult to access). You can use wire # 12-1-1 sold by the foot.

I have also included a couple of links on testing and troubleshooting brake controllers for you with additional information but I suspect it is just a bad or missing connection.

expert reply by: Michael H

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Answer 1

If you are getting a no trailer connected warning on your Tekonsha Prodigy P3 #90195 you may have a corroded or dirty connector which is hampering the connection. Check the vehicle and trailer plug to see if there is any type of corrosion or dirt…

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Answer 2

The L. display should show up on the Curt TriFlex brake controller, #C24VV, when it is plugged in. When you are installing the controller, the trailer should not be connected. The lever or button on the left side of the controller is the…

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Answer 3

The distance from the bottom of the mounting flange to the bottom of the outer tube on the Bulldog Round, A-Frame Jack part #BD155033 is 3-1/2". The mounting flange is 3/16" thick. I have attached a photo of these measurements for you as…

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Answer 4

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 5

It sounds like you are asking about the B&W Turnoverball Underbed Gooseneck Trailer Hitch w/ Custom Installation Kit - 30,000 lbs, #BWGNRK1104. The 45-1/8 inch measurement for the ball location is from the tailgate end edge of the bed, not…

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Answer 6

The Tekonsha Prodigy P3 Brake Controller, #90195, does not have an on and off switch. It will go into sleep mode after several minutes of no activity. The power draw when it is in the sleep mode is so negligible that it will not discharge the…

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Answer 7

I wasn't certain which year E-450 chassis the motor home was built on so I checked online copies of the owner's manuals for 2013 and 2014. According to the manual in the fuses section the brake controller fuse is in location 18 in the power…

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Answer 8

The Tekonsha Prodigy P3 #90195 has the ability to show a few different voltages when your vehicle is parked. The first option is your tow vehicle battery voltage which should be at least 12V if not more. The second is output power from the stoplight…

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Answer 9

Any time a trailer has turn signals that work but not the brake lights it can be an interesting situation. This is because the brake lights and turn signals on trailer tail lights are on the same circuit. In this situation it is almost always a bad…

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Answer 10

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 11

I am not entirely sure what process you took so I'll give you some other things to try, or maybe a different way to test the Prodigy P3 #90195. First, sever the blue wire a couple inches from the back of your controller. Then use a circuit tester…

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Answer 12

You can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part #10-1-1 (sold by the foot),…

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P3 Brake Control Shows No Trailer Connected Even with Trailer Connected to 2002 Ford F-150

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