Do You Have Wiring Diagram Instructions for the Pigtail Wiring Harness for Tekonsha # 7894?

Updated 04/16/2025 | Published 04/13/2025

Products Featured in This Question

Tekonsha Prodigy P2 Trailer Brake Controller - 1 to 4 Axles - Proportional

(2763)

$159.00

Pigtail Wiring Harness for Tekonsha and Draw-Tite Brake Controllers - 34" Long

(183)

$13.75

Question:

Hey guys, would it be possible to get a pdf with diagrams of the install instructions for the universal brake controller wiring kit? I was in the midst of installing when I moved to a different project for a couple of days and now I cant find the printed instructions my barn is a bit messy... Thank you in advance for your consideration.

asked by: M .

Expert Reply:

Hello Celia,

I attached the instructions to the Tekonsha Prodigy P2 Trailer Brake Controller - 1 to 4 Axles - Proportional # 90885 that you ordered back in 2018, hopefully that is the controller you are working with . They don't really go over the wiring directions in there, so hopefully this helps:

Installation Instructions:

-Mount the Brake Controller:

Follow manufacturer instructions for securely mounting the controller under your dash within easy reach and line of sight.

-Route the Pigtail:

Plug the 7894 pigtail into the back of your Tekonsha or Draw-Tite controller.

Route the wires under the dash toward your vehicle’s existing brake controller wiring or toward the firewall if hardwiring to the engine bay.

-Connect Wires:

Black (12V) ? Connect to a fused 12V power source, ideally from the vehicle's fuse box or battery (use a 20-30A inline fuse if direct to battery).

White (Ground) ? Connect to a clean metal surface on the chassis or directly to the negative battery terminal.

Red (Brake signal) ? Connect to the cold side of the brake pedal switch, which only has voltage when the brake is pressed.

Blue (Trailer brake output) ? Connect to the blue wire going to the 7-way trailer connector at the rear of the vehicle.

-Secure Connections:

Use butt connectors or solder and heat shrink tubing for solid, weather-resistant connections.

Neatly bundle and secure wires with zip ties.

-Test the System:

Plug in a trailer or use a brake controller tester.

Press the brake pedal and confirm the controller wakes up.

Use the manual override to confirm brake lights and trailer brakes activate.

If you have any questions along the way, feel free to comment below.