* Engine to chassis: A primary ground strap will connect the engine block (often near the starter) to the chassis (frame). This is a crucial ground. Look for a heavy-gauge cable bolted to both engine and frame.
* Battery to chassis: Another significant ground strap connects the negative (-) battery terminal to the chassis. This is usually a very thick cable, and the chassis connection point might be near the battery or elsewhere on the frame.
* Body to chassis: While not directly related to the engine, a ground strap connecting the body to the chassis is also important for electrical system integrity. This often shows up near the firewall or on the driver's side.
To find the straps:
1. Visual Inspection: Start by looking around the engine and battery. Follow any thick, black cables. They're typically bolted securely at both ends.
2. Wiring Diagrams: A repair manual (either physical or online) specific to your 1997 Chevy Blazer 4.3L Vortec will show the exact location of the ground straps. This is the most reliable method.
3. Online Forums: Search online forums (like Chevy Blazer forums) for pictures or discussions regarding ground strap locations on similar models. Use your year, engine, and model as search terms.
Important Note: If you're experiencing electrical problems, corroded or loose ground straps are a common culprit. Inspect them carefully for corrosion and ensure they are securely tightened. Clean any corrosion with a wire brush and apply dielectric grease to prevent future corrosion.
