Tow-Pro Link Installation Guide for Trailer Detection

This information is applicable to the following products: 

• Tow-Pro Link (EBRHX-ADH)

Some high-end vehicles have complex electronics system that require additional components to be used when a Tow-Pro Link is installed. Without the extra components, the vehicles will not correctly detect that a trailer is connected.

The vehicles that follow are known to require these extra components are listed here.

Required Parts

• 1 × diode or resistor protected relay, 10 A minimum — for example, Narva 12V Relay
• 1 × trailer socket with a reed switch — for example, Narva 7 Pin Trailer Socket or Narva 12 Pin Trailer Socket
• 1 × blade fuse holder
• 1 × blade fuse, from 2 A to 5 A rating

Install the components as follows

1. Connect the orange wire of the Tow-Pro Link to Pin 87 of the relay.
2. Connect the vehicle’s existing stop lamp wire to Pin 30 of the relay.
3. Install the new trailer socket.
   NOTE: This procedure is suitable for a normally-open (NO) reed switch. The reed switch is not polarity sensitive.
4. Connect one end of the reed switch in the trailer socket to Pin 85 of the relay.
5. Connect the other end of the reed switch to chassis ground.
6. Supply power to the relay as follows:
   1. Install a cable between the relay and the vehicle battery. Do not connect the cable to the vehicle battery at this time.
   2. Install a blade fuse holder in the cable as close to the vehicle battery as practical. Do not install the blade fuse at this time.
   3. Connect the end of the cable to the vehicle battery.
   4. Install a blade fuse rated from 2 A to 5 A into the blade fuse holder.
7. Protect each of the cables, connections and components from water and damage.
8. Test the Tow-Pro Link — do one of the steps that follow:
   • Use a test light to test the Tow-Pro Link.
   • Use a trailer to test the Tow-Pro Link — refer to the User Manual.