2 Pack 12V 40A 4 Pin SPST Relay with Harness Socket, 12AWG Heavy Duty Automotive Relay Built-in Diode for Car Truck Van Boat Motorcycle, Auto Fan, Horn, Headlight, Air Conditioner JD1912

["Advanced Circuit Protection: Integrated flyback diode effectively suppresses voltage spikes during switching, safeguarding your vehicle`s sensitive electronics (ECU, sensors) from costly damage.","Heavy Duty 40A Rating: Rated for 12V DC and 40 Amp continuous current. Tested for 100,000 electrical cycles and 10,000,000 mechanical cycles, ensuring long-term reliability under hood.","Complete Plug & Play Kit: Comes with a pre-wired 12AWG harness socket. No crimping or soldering required. Terminals are clearly marked (85, 86, 87) for error-free installation by DIYers & pros.","Compact & Robust Design: Silver alloy contacts ensure excellent conductivity and low heat generation. The small form factor fits standard relay boxes in cars, trucks, boats, and motorcycles.","Versatile Application: Package includes 2 complete relay & harness sets. Ideal for driving lights, air horns, fuel pumps, cooling fans, and headlight upgrades on 12V automotive systems."]