This kit will increase the intensity and improve the spread pattern by keeping all four lights on when in high beam mode. Designed specifically for all 1988-1998 GM full size trucks and SUVS. NOTE: This kit is compatible with all 1988-1998 GM trucks with low beam daytime running lights. Slight modifications may be necessary for some vehicles such as 1988-1991 Suburbans. This kit includes: 40-amp heavy duty relay; relay base with wire harness; crimp terminals & mounting hardware.