This heavy-duty 12V starter/glow plug relay is specifically designed for Isuzu NPR, NQR, and NPR-HD diesel engines, including 4HE1, 4JJ1, and 4HK1 5.2L models from 1994-2025. This relay serves as a crucial component in your vehicle's starting system, controlling the high-current flow to the starter motor or glow plugs. The compact design ensures easy installation while maintaining reliable performance in demanding conditions. Perfect for maintaining or replacing worn relays to ensure consistent cold starts and proper engine operation. Compatible with various Isuzu commercial vehicles and features the necessary specifications for seamless integration with existing electrical systems.