How to Diagnose and Repair a Broken Auto Light Socket

How to replace a headlight bulb and socket.

By Bob Lacivita and David Radtke

From The Family Handyman

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About This Project

Overview and Preparation

Step-by-Step Instructions and Pictures: How to Diagnose and Repair a Broken Auto Light Socket

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When a headlight goes out, the problem is usually a bad bulb, which is easily replaced. However, the problem could also be a corroded socket or a bad wire. Keep in mind that when several lights are out, such as both headlamps or both taillights, the problem is most likely a fuse. If the fuse is bad, you can replace it and be on your way.

TIP: Make sure your test light works before doing any diagnostics. Connect it to the negative battery terminal (or any good body ground) and touch the probe end to the positive-side battery terminal. The test light should light up.

TIP: Be careful not to touch two contacts at the same time or you could cause a short circuit and blow a fuse.

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 ($8 at an auto parts store).