Automotive Relay Tester | 11–25 V Digital Relay & Vehicle Battery Detector
A digital automotive relay tester designed for fast and reliable testing of 4-pin and 5-pin vehicle relays. Powered directly from a car battery, it provides clear pass/fail indication via LED lights and a bright digital display.
This automotive relay tester is a practical diagnostic tool for quickly determining whether a vehicle relay is functioning correctly. Designed for use with standard automotive relays, it supports both 4-pin and 5-pin configurations and connects directly to a vehicle battery for power.
During testing, the device automatically detects relay pin positions, evaluates relay activation and release timing, and checks consistency across multiple switching cycles. Clear LED indicators provide immediate feedback: a green light indicates normal operation, while a red light indicates a faulty or incompatible relay.
A bright digital display allows easy visibility during use, and long alligator clip leads enable secure connection to the vehicle battery. This tester is suitable for automotive maintenance, electrical diagnostics, workshops, and technicians who require a quick and repeatable method for relay verification.