CIRKIT BOSS AUX. FUSE BLOCK 3 CIRC. TXL WIRE WTHR SEALED RUBBER BOOT #70203 Eliminate spikes that damage bulbs to diagnostic computers! Protect constant and ignition hot circuits using this relay activated fuse block. Activation wire from any ignition source turns on the relay that operates the fuse block. Circuits individually fused for 15 amps. Includes: circuit breaker, relay, mounting hardware, & terminals. Protects your OEM warranty. Easy to install. Mounts under hood where moisture/dust resistance is important. 1 constant-hot and 2 ignition-hot circuits. Uses one 30 amp relay (Includes cover for fuses).