Which colour wire is the main beam on the back of the head light many thanks david

to to know about the color of the wire check the repair manual but if you don't have it then go to the given link from where you can have one http://toolsnyou.com/

Depends on the option package as well as what it was country it was built for. Your best bet is to use a voltmeter to determine which wire is it. You will need to drive a relay with it. Adding the light bar directly to it may cause issues.

one wire will for high beam
one wire will be for low beam
the last wire will be ground wire
as fog light have only one beam you can use the low beam wire and parallel wire it to the fog lights
that way you have the head lights still and the fog lights as accessories correctly wired according to regulations
how to do it simply-- find the low beam power wire ( light switch on low beam and power at the light bulb check ed with a multi meter set on volts
solder , piggy back, or double plug in a connection into that wire and run one wire to the left fog light and one to the right fog light connect each fog light to an individual ground wire and connect those wires back to the ground wire for the main lights
Now having done that simple addition to the lighting system another problem has come up
The wiring will now be too light to carry fog light current and or the light switch will burn out
To over come this problem, the circuit needs a relay
fit a relay on the bike and now run the low beam wire to a terminal of the relay
run the other terminal wire to ground
this enables the relay to operate when the low beam is switched on but at this will not switch on the lights yet
now you have to run a heavy gauge wire (fused at the battery) to one of the power terminals of the relay and from the other power terminal to the connection for the fog and low beam lights
Now it all works switch on the high beam and no for lights
change to low beam and the fog lights come on as well
All nice and legal
Of course if you don't care about being legal just buy a 30 amp toggle switch and run a fused wire directly to the switch from the battery to the lights and then to ground from the lights
You will know that the generator / alternator for the bike will not be able to run the fog lights with or without the main lights so what will you have achieved

Wire size? or way to trace wire? Look at wire departing from the the back of headlight. It may have protective plastic over the two wires that serve the head lamp. (high beam and low beam) the common or ground is usually the connection to the frame.

from the front or back of the head light , there will be 2/3 adjusting knobs / screws . Place the vehicle on a level surface about 3 feet from a plain coloured wall. You will see the centre of the beam( High beam). The centre of the beam is to be at the same height as the centre of the head light lense and properly adjusted pointing slightly to the passenger side of the vehicle . This prevents full beam in the eyes of oncoming cars.

check all the wires give the earth wire end a clean up and try then sounds like bad connection or the bulb could be put in the wrong way

this could be solved by taking the bulb out of its holder and cleaning the contact of the bulb and holder.
turn the ignition on after this with the bulbs in the holder and plugged in but not in the headlight kitself.Turn the lights on and see if the work if still the same try moving the bulb while on in its older and see if its just loose. if so holding it one way it will work. wedge something something to hold it in place or buy a used bulb holder.
Check the fuses at the same time and the wire plug that powers the bulb. check and clean the contacts of these also
Let me know how it goes and ill help again if it persists.
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first thing i would check is the wiring were the plow wiring is spliced in at this is most likly the culprate. or you may have a bad multi function switch in the steering column

Your problem sounds like either the globe (did you touch the glass on the globe if so that could be your problem as you musent touch the top part or glass with your hand (use a clean piece of cloth) and also change it with the other side light and if it works then its the head light plug or the wiring .
If you carnt find the problem with the wiring then take the colour from the light on the wire (main beam should be BLUE with White trace) so find the wire and run a new wire from the other side head light and it should work ..But make sure its not the globe first.
If the main beam light works on the left hand side then it carnt be the earth wire on the back of the light plug
1MAIN BEAM 2 DIP BEAM WIRE.3 EARTH WIRE so check the earth wire as well (let me know how you go) are you on Skype Ron

pull the headlight out and turn on the high beam.with a test light check which of the 3 pins has the test light coming on