This headlight upgrade harness kit eliminates the main cause of fuse, headlight switch, and turn signal switch overheating and damage. It consists of considerably improved wiring and relays. The harness can also greatly increase voltage to the headlights, which will be seen clearly as your headlights will be significantly brighter. The exact amount of difference will depend on the condition of the old original harness, of which most 240Z's on the road are poor. On most 240Z's, the difference will be substantial. The kit also is strongly recommended for anybody upgrading to our standard H4 headlights, and should be considered mandatory to anybody desiring to run off-road H4 bulbs above 60 watts. The kit completely integrates into your 240Z without any cutting or drilling. The relay pack and improved ground wires will be mounted using the stock holes already on your 240Z. The power wire will be connected directly to your positive battery post. Includes complete instructions. For 240Z only.