Before you install higher watt bulbs or higher amp fuzes (
The fuse is to protect the wires from overheating and catching fire) There are some things you can or should do to improve the anemic photon output from H4s. First check that everything is clean and tight. Bulb sockets get crusty as do the fuse bases. Disconnect the + side of the battery when cleaning the fuse bases!
THe BEST thing all together. The power goes through the switch so adding relays is a good thing to do. It will save the $$$ high/low switch and safely pass far more amps to the bulbs. With relays you will only pass control power through the high/low switch. Wire the power from the battery through the relays and on to the bulbs with good heavy wire rather a size over what is needed current wise. Wire and fuse accordingly and you can install some good high watt bulbs with the socket being the limiting factor.
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