Both 30 and 20 amp relay fuel pump wiring kits and harnesses have auto - reset style integrated circuit boards that help ensure any electrical shorts are remedied. Each kit includes a pre - wired relay receptacle with 80 of red wire for activation (12 gauge for 20 - Amp Relay Kit and 10 gauge for 30 - Amp Relay Kit) and 80 of 10 gauge black wire for a high current ground circuit, an Amp relay, circuit breaker with mounting tab, crimp terminals and mounting hardware.