A common source of issues for most dual air compressor set ups is the amperage run through the provided relays. We have done away with those and began using an 80 amp continuous duty relay to handle the electrical load. We use a 4 gauge welding cable and a mega fuse to ensure safety. 

This kit includes:

-25 ft of 4 gauge red welding cable

-4 cable lugs 

-16" of heat shrink

-80 amp continuous duty relay

-fuse holder

-80 amp fuse (2 - one for that backup)

-insulated loop clamps to secure battery cable and air line (pack of 25)

-10 grommets for air line / battery cable / wiring

Optional air compressor insulators available for helping to quite compressors down.