1. Locate the Flasher Unit:
* Under the Dash: The most common location for the flasher unit is under the dashboard, typically near the steering column. You might need to remove a panel or access it through an opening. Look for a small, square or rectangular unit with wires connected to it. It might be clipped in or held by a screw.
* Fuse Box: Some models might have it located in the fuse box (often under the hood, but sometimes under the dash). Refer to your owner's manual for your fuse box layout. The flasher unit will likely be labeled or easily identifiable by its size and shape.
* Behind the Glove Box: In some rare cases, it might be behind the glove box.
2. Preparation:
* Disconnect the Battery: This is crucial to prevent electrical shorts and injury. Disconnect the negative (-) terminal first.
* Gather Tools: You'll likely need a small flathead screwdriver or a small pliers (depending on how the flasher unit is secured) and a replacement flasher unit. Make sure you get the correct flasher unit for your Blazer. The part number should be on the old unit or you can find it online by searching for your year, make, and model.
3. Removing the Old Flasher Unit:
* Access the Unit: Once you've located the flasher relay, carefully remove any panels or covers that are blocking access.
* Disconnect the Wires: Carefully note the position of the wires before disconnecting them. Some units have a simple push-in connector, while others might use a small clip or screw. Take pictures if needed.
* Remove the Unit: Carefully remove the old flasher unit from its housing. It might be a simple pull, or it might require gently prying it loose with a flathead screwdriver.
4. Installing the New Flasher Unit:
* Insert the New Unit: Carefully insert the new flasher unit into the housing, ensuring it's seated correctly.
* Reconnect the Wires: Reconnect the wires to the new flasher unit, matching them exactly to their previous positions.
* Secure the Unit: Secure the flasher unit in place with any clips or screws.
* Reassemble: Reassemble any panels or covers you removed.
5. Reconnect the Battery and Test:
* Reconnect the Battery: Reconnect the positive (+) terminal to the battery.
* Test the Turn Signals and Hazard Lights: Turn on your turn signals and hazard lights to ensure they are working correctly. If not, double-check all connections.
Important Notes:
* Consult your owner's manual: This is the most reliable source of information for your specific vehicle.
* Take pictures: Before disconnecting anything, take pictures so you can easily reassemble everything.
* If unsure, seek professional help: If you're uncomfortable working on your car's electrical system, it's best to take it to a qualified mechanic.
This guide provides general instructions. The exact process may vary slightly depending on your specific vehicle. Always prioritize safety and consult your owner's manual.
