Troubleshooting Prodigy Brake Controller that Flashes SH Code  

Question:

Expert Reply:

The error code you are reading indicates that there is a short circuit somewhere in the brake outupt circut on your trailer. Most likely, there is a pinched wire or at some point the wire insulation has cracked or been worn to the point where the copper wire is contacting the trailer frame or some other metal part. Start at the trailer connector, making sure that it's not corroded or damaged, then work your way back to the brake magnets, examining the wire as you go.

The controller can also be at fault as they can go bad.

Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like the Quickee Tester, part # 3808, you should get output to the controller side of the wire you severed. If the manual slide activates the trailer brake output wire properly, try the brake pedal. If the brake pedal activates the brake output properly also then the problem is farther back either in the vehicle wiring or on the trailer.

If either the brake pedal or the manual slide are not functioning properly you will need to test the wires going into the brake controller. Make sure you have power entering the brake controller on the black wire. On the red wire you will only want power when the brake pedal is pressed.

If there is power on the red wire before the brake pedal is pressed you have connected the red wire from the brake controller to the wrong circuit. You would then need to find the brake switch wire that has power ONLY when the brake pedal is activated.

If these connections check out and the brake controller is properly grounded then there is possibly a problem inside the brake controller.

I am including a link to a video that will show you how to test the wiring on a brake controller.

expert reply by: Jameson C

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