Why Is Pigtail Wiring Harness with Diode for Brake Controllers Required for a 2019 Toyota Highlander
Updated 03/16/2021 | Published 03/11/2021
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Question:
Is the Pigtail Wiring Harness with diode for Tekonsha Brake Controller #7865 required when using a Tekonsha OEM Replacement Vehicle Wiring Harness with Brake Controller Adapter-7 way Trailer Connector #22110 and a Tekonsha Prodigy P2 Brake Controller #90885 on a 2019 Toyota Highlander LE hybrid without factory tow package?
asked by: Gerald A
Expert Reply:
The Pigtail Wiring Harness with Diode for Tekonsha and Draw-Tite Brake Controllers part # 7865 is required for a 2019 Toyota Highlander no matter which trailer connector or brake controller you're using as the diode is on the stop light switch connection which splices into the vehicle's brake pedal. This connection is independent of the harness or controller. The Tekonsha Prodigy P2 Trailer Brake Controller part # 90885 and Tekonsha OEM Replacement Vehicle Wiring Harness part # 22119 are both fine options to complete the setup.
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