How to Install a Turn Signal Socket and Bulb

Several early 21st century cars came with one–piece lamps containing all the sockets and bulbs in each corner. That made it impossible for you to install a turn signal socket and bulb. Auto makers charged over 300 dollars for these. Each time one of the 89 cent bulbs went out, a technician had to replace the entire lamp at an additional 90 dollar an hour labor fee. The trend did not last. Auto bulbs and sockets are accessible to consumers for cost effective replacements on most models.

Things You'll Need

• Replacement bulb
• Specific socket
• Adjustable wrench
• Wire cutters
• Electrical tape

Instructions

1. Purchase the bulb and socket. The owner’s manual will show you what type of bulbs are used for every light in the car. Common types like 1157’s are sold in supermarkets and drug stores. Auto parts stores have them too, and that’s where you’ll have to get the socket. The clerk will need to know the socket location and model, make and year of the car.

2. Shut off the power. Disconnect the battery cables to avoid any chance of electrical shock. Loosen the cable clamps from the terminals with an adjustable wrench and move the cables aside.

3. Remove the socket from the lens. Take the socket out from the inner side of the lens. This will be different for almost every model. Refer to the owners manual. Some turn signal lenses unscrew from the body. Others give access to sockets from the back of lenses, under the hood and inside the trunk. Hold the socket with a few fingers and twist it slightly counterclockwise to free it. Then pull the socket straight out.

4. Remove and replace the socket. Cut the two wires attached to the socket behind the existing connection. Strip 1/4 inch of the insulation off the wires and twist them around the matching colored wires of the new socket. Rewrap the connections with electrical tape. For complete instructions on this step see my article on How to Connect a New Turn Signal Socket.

5. Insert the bulb. Find the two tiny tips sticking out from the bulb connector sleeve. These fit into slots in the socket housing. Push the bulb in as far as you can then turn it slightly clockwise.

6. Test and reassemble. Reconnect the battery and check the working order of your new turn signal. If all is well, reseat the socket in the lens and blink on.

Tips & Warnings

• Some auto makers still make it exceptionally difficult to install a turn signal socket and bulb. The owners manual of such models will recommend taking the car to a dealership for such replacements. Ask a reputable mechanic for advice.