How to make more out of your H4


This is how you connect your High/Low beam directly to battery via relays to prevent power loss in the wiring.

Instead of having the power from battrery via hogh/low beam switch in compartment, now it is connected directly to battery. No power loss -> More power at light bulb


This diagram shows how to connect via twin relays.(2 outputs, 2x87)

Here is a description for use of single relays for one side. Do the same for both sides.

This solution will use 4 relays insted of 2 as above, but if 1 relay fails, you will still have lights on both sides

Wire connection of H4 light bulb