CIRKIT BOSS FUSE BLOCK 3 CIRCUITS (2 IGN. HOT 1 CONSTANT HOT RELAY) #70103 - Eliminate spikes that damage bulbs to diagnostic computers! Protect constant & ignition hot circuits using an add-on relay activated fuse block. Activation wire from any ignition source turns on the relay that operates the fuse block. Made with TXL cross-link polyethylene wire rated to 275ú @ 600 volts. Circuits individually fused for 15 amps. Includes an in-line circuit breaker, relay, mounting hardware, & terminals. Protects OEM warranty. Easy to install, uses one 30 Amp Relay.