This Test Light Maximum Measure Voltage is Upgrade to 60V,BOAK Auto Circuit Tester Ideal for Checking Various Vehicles Electrical Circuits, Quickly Check Automotive Headlights, Taillights ...

In this article, we'll show you how to replace the bulb, and if that fails, we'll show you how to diagnose a bad socket and probe the wiring with a simple 12-volt automotive test light.