The Relay & Fuse Box (OEM Numbers: 8-97063150-1 / 8970631501) is a premium-quality, direct replacement electrical distribution component designed specifically for ISUZU NKR77 series light-duty trucks equipped with 4JH1 diesel engines. This essential electrical component serves as the central hub for the vehicle's relay and fuse system, housing multiple relays and fuses that protect electrical circuits and control power distribution to various vehicle systems including lighting, starting, charging, and accessory functions.

• OE Quality: Manufactured to strict ISUZU dimensional and electrical specifications for perfect fit and function
• Durable Construction: Heat-resistant plastic housing protects relays and fuses from dust, moisture, and vibration
• High-Conductivity Terminals: Copper alloy terminals with corrosion-resistant plating ensure reliable electrical connections
• Precision-Molded Slots: Exact fit for relays and fuses, preventing loose connections and intermittent faults
• Direct Replacement: Matches OE mounting points, connector layout, and fuse/relay configuration
• Long Service Life: Engineered for commercial truck applications and continuous exposure to under-hood conditions
• Easy Installation: Bolt-on replacement with original connectors - no modification required

This relay and fuse box is specifically designed for ISUZU light-duty trucks and commercial vehicles. Common applications include:

• ISUZU NKR77 (Light-Duty Trucks)
• ISUZU N Series (NH, NK, NP - as applicable)
• ISUZU 4JH1 Engine Specifications:
  • 4-Cylinder, Inline Diesel
  • Displacement: 3.0L
  • Valvetrain: OHV
  • Application: Light-duty trucks and commercial vehicles

Professional mechanic or auto electrician installation recommended:

1. Disconnect battery - Always disconnect the negative terminal before working on electrical components
2. Locate the relay and fuse box - Typically mounted in the engine compartment or under the dashboard
3. Remove the old box - Disconnect all electrical connectors and unbolt the old relay and fuse box
4. Note relay and fuse layout - Document position of all relays and fuses for proper reinstallation
5. Transfer relays and fuses - Move existing components to new box in correct positions
6. Inspect connectors - Check for corrosion, damage, or loose terminals
7. Install the new box - Position on mounting points and align bolt holes
8. Secure mounting bolts - Tighten to manufacturer torque specifications
9. Reconnect electrical connectors - Plug all connectors securely into new box
10. Install relays and fuses - Place in correct positions per wiring diagram
11. Reconnect battery - Reconnect the negative terminal
12. Test all functions - Verify proper operation of all electrical systems
13. Check for blown fuses - Inspect fuses for continuity and replace as needed

• Electrical Testing: Each box tested for continuity and proper terminal connection
• Dimensional Inspection: Mounting points, connector layout, and fuse/relay slots verified for exact fit
• Material Verification: Housing and terminal materials meet ISUZU durability specifications
• Heat Resistance Testing: Housing material tested for performance under high under-hood temperatures
• Visual Inspection: 100% checked for cracks, defects, or manufacturing flaws
• Packaged Safely: Protected and packaged to prevent damage during transit