This heavy duty relay harness is designed to power fog lights with H11 style connectors and requires no cutting or splicing! The harness is triggered by an "add a fuse" style input which can be connected into your engine compartment fuse box ( mini fuse style ).
The fog lights will automatically come on when the selected circuit is powered. The low beam or parking light slots are the most popular to trigger the harness when used with fog lights. Alternatively you can also use the high beam slot as a signal when powering driving lights.
No need to pass wires through the firewall for a switch!