ITEM NAME:40 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive R S7K1 40 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive R S7K1 5-pin SPDT 12V DC 40A waterproof automotive relay is the Perfect electrical relay to be used on off-road vehicles, boats, and dirt track cars that are often exposed to wet or muddy.5-Pin SPDT (Single Pole Double Throw) Relay. 40A High Switching Capability. Waterproof construction. Wire Specifications: Black - Ground (85), Yellow- VDC (30), Red - Output N/C (87a), and Blue - Output N/O (87).