It’s important to replace the earth wire to the bulb as well as the power supply, I used two relays one for main and one for dip beam, I ran an earth and power wire direct from the bikes battery, all terminals are crimped and then soldered where ever possible for added durability, I purchased a replacement three pin headlamp bulb connector from a motor factor, that allowed me to completely upgrade the wiring to the 100/80w bulb, one more thing, you should never rely on just crimped connectors especially on more heavy duty applications.
All wires and connections have been covered in a double helping of heat shrink to give it that more professional look,
Just one thing you must be aware of, by upgrading to a 100w bulb and renewing the wiring, (as you have to or a fire is imminent), you are potentially creating more things that can go wrong like two relays extra wiring 12 more connections soldered or not can still give problems in later life!!