As a wee off shot of the "headlamp conversion", I would like to say that, although the link on this forum is accurate, it is highly over complicated and is no better a job than the way I done it. So here is how...
You will need -
1 Yellow (smaller of the two sizes) female spade crimp/connerctor
1/2 meter of 1.5 or 2.5 copper wire
Soldering iron & snips
Ok, disconnect the battery and locate the wire that feeds the headlamp on dipped beam. Got it? Right, cut it and bare about 10mm on each end, as well as 10mm on one end of your 1/2 meter of wire. Now solder those three together.
Now run the cable tidy as you like to the right headlamp connector block. Cut to lenth and bare around 15mm. Twist and fold, then slip into the female spade, after removing the yellow seathing. Now crimp (I like to add a solder too, for good measure).
Slip the spade into the remaining space in the connector block and tape up the lot with warmed electrical tape. Try make it as water tight as you can.
Plug the connector onto your bulb and tell me that is not easier than all the pissing about...And for anyone in doubt, a good solder is far superior to a crimp.
Simples