* Under the dash: This is the most common location. Look behind the instrument panel, often near the fuse box. You might need to remove a panel to access it.
* In the underhood fuse box: Less common, but possible. Check your owner's manual or a wiring diagram for your specific vehicle to confirm.
To find it definitively:
1. Consult your owner's manual: This is the best resource for your specific vehicle. The manual will have a diagram showing the fuse box locations and what each relay controls.
2. Look for a fuse box diagram: There's usually a diagram on the inside cover of the fuse box itself.
3. Use a wiring diagram: A more advanced approach, but if you have access to a wiring diagram for your year and model Blazer, it will pinpoint the exact location of the flasher relay. You can often find these online through repair manuals or automotive websites.
If you can't locate it using these methods, a qualified mechanic will be able to quickly find it for you. Be careful when working with electrical components; disconnect the battery's negative terminal before doing any work.
