Morimoto offers high-quality 4-pin automotive relays designed for building custom relay harnesses. These relays are not only cost-effective but also feature three layers of silicone seals, providing protection against the elements. With an industry-standard layout including switch, ground, power input, and power output, they offer versatility in various applications. These relays can handle 12V at up to 40 Amps through their copper coils and feature an integrated flyback diode to prevent back-feeding. Morimoto's relays are the same reliable components found in their HD Relay Harness, allowing users to create professional-grade harnesses, and optional brackets enable the combination of multiple relays for a clean, customized setup.