Wiring diagram added
Ok you lucky lot, I have done you a wiring diagram with my awesome MSPAINT sk1llz
The colours aren't accurate because I cannot remember what they were and don't own a CTR anymore to check
Basically in the OEM wiring you have 3 wires
1st is a switched live - when you switch the headlights on you get +12v
2nd is a switched earth for main beam - when switch is in main beam this is earthed
3rd is a switched earth for headlights - when not in main beam this is earthed - Not required
Once you've identified these then just follow the diagram.
Please don't listen to the guy saying you don't need a relay, true you can get by without it by bridging the live feed over to the main beam, but then you're running both sets of lights (hi and low beam) off of one circuit and if you've seen the OEM wiring its about 5 amp cable at best. Running both bulbs you're going be drawing 7 or 8 amps.
How it works
When you flick the lights on you get +12v on the switched live
This brings on the headlights and energizes the relay coil so you get +12v to each main beam bulb
When you flick to main beam the tw switched main beam earths complete the circuit and main beam comes on