Purpose of Separate Ground Lead on Brake Controller Wiring Adapter Part # 3040-P for 2010 Tundra

Question:

My 2010 Tundra has the tow package with wiring for the brake controller. I will be using a Tek P3, but I noticed your 3040-p harness has a ground pigtail. Why is the harness not using the ground provided in the controller hook up under the left kick panel?

asked by: omar n

Expert Reply:

According to one of our contacts at Tekonsha, the harness does utilize the ground connection in the factory plug under the dash, but Toyota used a very small gauge wire in the plug. In order to ensure a proper ground connection and reliable brake operation, a separate ground lead is used as well.

We have an installation video that you might find helpful. The video shows a controller being installed on a 2007 Tundra, but the procedure would be similar on your 2010 model. I will provide a link to the video below.

expert reply by: Mike L