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Frequently Asked Questions

Having installation problems? Are your brakes locking, dragging or grabbing? Just visit our troubleshooting section on the wiring instructions for quick answers to these questions and more. Or, if you're looking for information on a more specific question, please go to Contact Us to fill out the form and we'll figure it out for you—without the hassle of a phone call. 


Wiring Questions· What are the functions of the four wires?· Is there a direct plug in harness available for my vehicle?· I am in need of further assistance or are experiencing a concern about my wiring.
Q.) What are the functions of the four wires?
  · Black is the Battery Power
· White is the Ground
· Red is the Signal from the Brake Light Switch
· Blue is the Electrical Brake Feed

Q.) Is there a direct plug in harness available for my vehicle?
A.) If your vehicle is equipped with factory tow package the following harnesses are available. These harnesses will plug into the tow package connector and into the Prodigy® and Primus™ brake controls. By removing the black connector they can also be used on any brake control.
  · 2003 to 2005 GM Trucks and SUVs the harness needed is the 3015.
· 1999 to 2002 GM Trucks and SUVs the harness needed is the 3025.
· 1994 to 2005 Ford Trucks and SUVs (exclud. '05 Super Duty) the harness needed is the 3035.
· 2005 Ford Super Duty the harness needed is the 3065.
· 1996 to 2005 Dodge Trucks and SUVs the harness needed is the 3020.
· 2002 to 2005 Toyota Trucks and SUVs the harness needed is the 3040.
· 2004 to 2005 Nissan Trucks and SUVs the harness needed is the 3050.

Q.) I am in need of further assistance or are experiencing a concern about my wiring.
A.) Please call Tech Support at 888-785-5832 or Go to the Contact Us Link on this website.