H7 HID Xenon Relay Harness Solves Issues with Poor Electrical Systems GENSSI H7 Standard Relay for HID Kit Installation 40A H7 type plug slides right into standard H7 bulb plugs ; Plug and Play Includes Fuse and all wiring 30A Fuse; 40A Relay Notice: If vehicle is very wide; such as a SEMI truck the wire from one headlight to the other headlight may need to be extended Pack of 1; H7 is common on euro cars for headlights; low beams ; fog lights