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Final report ..... The fuse was blowing because the ignition switch was the wrong one!! It looked at first sight to be the same but it was wired internally differently. There is no way it could ever work although it fitted perfectly. Andy's Motorcycles ad was rather misleading in that it implied (as do many of them) that the switch would suit all YBR125's with a four wire ignition switch, three wires in a block and one loose "bullet type" connector. This is not true. My bike is a 2008 YBR125 Custom Looking at the wiring diagram it clearly shows that there are four connections inside the switch and in the "off" position NONE of the wires make contact, they are all isolated. In the "on" position each of two pairs make contact. For example: "Off" position - no wires make contact - all open circuit. Red (loose wire, bullet connector) main 12v feed from battery. Brown (block connector) Black (block connector) Black/white (block connector) "On" position Red wire connected to Brown wire Black wire connected to Black/white wire The switch that was supplied made one pair contact in the "on" position while the other pair was open circuit, and in the "off" position the roles were reversed. It could never be wired to suit my bike. Physically the switches looked the same (apart from wire colour) and you need a meter to test exactly which wires are switched in which position. It is not easy to source the proper switch, even main Yamaha dealers are confused. Luckily, because the two switches clearly come from the same manufacturer and it is only the contact plates that are different, I was able to carefully prise open the electrical contact plates and swap the correct contacts from the old switch into the housing of the new switch - brilliant. Be warned.