This kit is designed specifically for all US BUILT 1999-2002 GM full size trucks and SUVS to increase the intensity and improve the spread pattern by keeping all four lights on when in high beam mode. NOTE: Kit is compatible with all 1999-2002 GM trucks with low beam daytime running lights. Some 1999 and later trucks wiring did not change. If your headlight wires are tan and green please use Painless kit #30802; if you see purple and yellow please use Painless kit #30821. For other GM applications contact the Painless Tech Line. This kit includes: Heavy duty weatherproof 40-amp relay, weatherproof relay base with wire harness, crimp terminals and mounting hardware.