This relay kit is ideal for use with high amperage single fans or with standard dual cooling fan applications. Protects the electrical system from voltage and amperage spikes and prevents the fan from feeding voltage back through the vehicles' wiring system. This kit includes: SPST 70-amp heavy duty relay, relay base with harness (6' input, 2' output), 70-amp maxi fuse with mounting base and cover, crimp on terminals & mounting hardware.