Accessory guidePower Probe Circuit Tester

This comprehensive workshop guide covers the Power Probe circuit tester from basic principles through advanced diagnostic techniques, written for working mechanics and serious DIYers who need to power and test circuits without causing damage. You will learn how to select the right tester for your work, set it up safely, and execute step-by-step tests on relays, solenoids, motors, and sensor wiring. Worked examples show how to interpret voltage drops, continuity, and injected power results so you can pinpoint opens, shorts, and high-resistance faults quickly. By the end, you will be able to perform confident circuit diagnostics, avoid common mistakes, maintain your tool properly, and recognize when a job requires a specialist.