Bill, to get the most from your H4 headlight you need to clean up the contacts in the on/off and high/low beam switches as well as any connections in the circuit.
When I first went to an H4 bulb my bike would blow the bulbs as well as not charge well.
I went through and cleaned up eveything. Works well now.
The stock wiring for the headlight is only 18 ga wire. You can run a 14 ga wire from a fuse to a headlight relay, one of the five wire ones. Hook this wire to 30, this will send power out on 87A, hook this to low beam off the headlight. Hook 87 to high beam Hook the high beam wire from the high/low switch to terminal 85, 86 to ground.
Use the 14ga wire for all this extra wiring. You can even put the relay inside the headlight bucket if there is room.
This will send power to the low beam with the high/low switch in low beam, when you flip to high beam it trips the relay, turning off the low beam, turning on the high beam.
This set up sends power more directly from the battery to the headlight. Bypasses all the switches and wiring of the stock harness.
Leo