Troubleshooting N.C on Tekonsha Prodigy Brake Controller and Constant Power to Blue Wire

Question

Question:

When I hook up the unit and turn dial down, instead of giving me the oo it keeps saying n.c should the 7 prong blue terminal have constant power to it with truck on?

asked by: Fabio

0

Expert Reply:

It sounds like there may be an issue with the brake output circuit (blue wire) between the brake controller and 7-way connector. The blue wire should only be receiving power when the brake pedal is pressed or with the manual override applied on the controller. The "N.C" you are seeing on the Prodigy # 90885 controller can also be an indication of this particular issue.

I first recommend going into your vehicle and testing the brake controller itself to make sure it is not causing the problem. You will need to sever the blue wire a few inches from the back of the controller. Then use a circuit tester like # PTW2993 to test the end of the blue wire coming from the controller. This wire should only have power when you apply the manual override. If it shows power when you are not doing anything, then there is something wrong with the controller and it likely needs to be replaced.

If it tests like it should, then go ahead and reconnect the blue wire. I then recommend going outside the vehicle and looking at the trailer connector on the vehicle side. Check for any dirt or corrosion that might be preventing a secure connection with the trailer. Simply clean out as needed. You can also test the brake output pin to see if it only shows power with the manual override on the controller activated. Again, if it shows power at any other time, there is a short somewhere between the connector and brake controller that you will simply need to track down. You can run up the wiring to check for any damaged, exposed or cut wires and fix as needed.

If you are still unable to locate and resolve the issue, please let me know and I will be happy to look into this further. I have also attached a troubleshooting article that you might find helpful.

expert reply by: Chris R

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Answer 1

That is no problem. I have included a picture of exactly what you are looking for: a diagram of a vehicle side 7-Way trailer connector, front and back views. I have also linked an FAQ with other wiring diagrams. The colors listed are commonly used…

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Answer 2

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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Answer 3

The first error code, SH, you are seeing on the Prodigy Brake Controller (instructions linked below) means the brake wire sees a short circuit during idle condition. The second code, OL, indicates an overload condition during operation. For the first…

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Answer 4

Your left turn/stop light circuit is shorting out to the brake output circuit of your trailer wiring. Normally when this happens it is the right turn signal circuit since the pins on a 7-way of these two circuits are right next to each other. What…

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Answer 5

This isn't the first time I've heard of this type of issue. It sounds like the functions of your trailer wiring are not synced with your truck. Because you have used two trucks, the issue appears to be with the trailer. I've attached a…

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Answer 6

The problem is that someone either ran your brake light/blinker circuit to the brake output circuit of your vehicle 7-way, or the two circuits have shorted out together. I attached a diagram that shows how a 7-way should be wired up so that you can…

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Answer 7

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 8

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 9

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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

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 12

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are marked…

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