The safe way to add electrical accessories to any vehicle is with a CirKit Boss. The first circuit isolator system available with both constant and ignition hot circuit kits. Protects your OEM and is easy to install. Provides three 20-amp constant hot and four ignition hot circuits with a maximum total amperage handling of 40 Amps. This kit includes: Weatherproof 40-amp SPST relay, weatherproof 50-amp circuit breaker, weatherproof relay base/fuse block with harness, weatherproof crimp-on heat-shrinkable terminals, weatherproof fuse block cover and mounting hardware.