Need a switched power source on a trailer that lacks reverse lights or any other switched circuits beyond brake lights.

Standard trailer wiring only provides constant power, brake, turn, and ground; no built-in switched accessory circuit for add-ons.

Severity

2Mild

Willingness to Pay

implied

Added

May 24, 2026

App Concept

TrailerTap Relay

TrailerTap Relay is a plug-and-play module that senses voltage from the brake or turn signal wires to provide switched power to trailer accessories. No splicing into vehicle harness needed; installs inline at the trailer connector.

Key Features

Detects brake or turn signal activation to trigger switched power
Inline adapter for standard 7-pin or 4-pin trailer connectors
Adjustable timeout to keep power on for set duration after signal stops
Weatherproof enclosure with LED indicator

Target Users: DIY trailer owners and small fleet operators needing switched power for accessories like reverse cameras, work lights, or electric brakes.

Revenue Model: $49.99 one-time purchase, $5.99 shipping

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