However, there's no single definitive location. The exact placement can vary slightly depending on the specific trim level and options on your Blazer. You'll need to carefully inspect the wiring harness near the battery and fuse box. Look for wires that are thicker than typical circuit wires and might have a slightly different color or texture in a short section.
Consult your owner's manual if you have one. It might have a diagram showing their location. If not, a repair manual specific to your year and model S-10 Blazer will be the most reliable resource. You can usually find these online or at auto parts stores.