Troubleshooting Prodigy P2 # 90885 Installation on 2012 Ford F-150 With N.C. Appearing in LCD

Question:

My 2012 f150 did not come with the tow package. I have done everything one of your experts has told me and have also watched all the videos i could find on your website. When i plug into a trailer the controller reads N C still. What would cause this problem?

asked by: David B

Expert Reply:

One way to troubleshoot is if you can hook your truck up to another trailer. By doing this you will be able to easily determine if you have an issue on your truck or trailer. If your brake controller works properly on the other trailer, then you know your problem is on your trailer. If your brake controller still reads n.c. then it has to do with the setup in your truck.

If another trailer is not available, or your brake controller would not set up when hooked to another trailer then you can test your 7-way connector with a circuit tester like # PTW2993. On your truck side, as noted in the picture, test the outside pin located in the 5 o'clock position. If you are not receiving signal, then you should check that your blue wire is properly attached to the back of the 7-way connector and also the brake controller itself.

There are three possibilities if the n.c. continues to display when hooked up: the trailer is connected with an open circuit on brake line; the trailer connector is disconnected or corroded; or the trailer brake magnets have a poor ground connection.

Check the connections of the blue wire from your brake controller to the 7-way on your truck. Verify that each side is securely connected.

Inspect the trailer connector for damage, corrosion or dirt. All of these can also hinder the connection. Damage can be as simple as a bent pin. If the plug is damaged, it may need to be removed and replaced. If the connector is just full of corrosion or dirt it can simply be cleaned out.

Finally, the last possibility that your brake controller is reading n.c. is the loss of the trailer brake magnet ground. On your trailer brakes there are two leads that exit each brake assembly. One lead from each magnet needs to ground to the trailer frame. The brake magnets carry no polarity, so it does not matter which lead is grounded and which lead is connected to the brake output circuit.

For reference I have attached three FAQ articles, one is a basic wiring, one is covering brake controllers. and the last one is testing brake magnets.