Test Light or Power Probe? Side by Side Comparison for Car Electrical Diagnosis

Circuit tester (test light) vs power probe, compared side by side. In this video we explain what a 12 volt circuit tester is, what a power probe is, how each tool works, and which one you should buy for automotive electrical diagnostics. We show you how to use a test light to check for power and ground, and how a power probe goes further by letting you supply power or ground directly to a component, test circuits, activate relays, fuel pumps, cooling fans, and window motors, and troubleshoot wiring problems faster.