Since I've had my 907 all the lights on the bike, including the headlight, were varying in intensity slightly in time with the indicators every time I used them. I went round all the earth connections, then the battery positive connections and eventually found that it was dropping over 1V across the ignition switch when the headlights were on.
To sort this I fitted a 30A relay close to the fuse box and cut the brown return wire from the ignition switch that normally goes to the fuse box and connected it to pin 85 of the relay, adding an earth to pin 86. I took a Tee off the thick red wire from the Fusebox 25A fuse that goes to the ignition switch and connected that to pin 30 of the relay. Pin 87 was then connected to the other side of the cut brown wire connecting it to the fusebox for the switched circuits.
So that now when the ignition switch is turned on the relay switches and output from the 25A fuse is connected directly to the input side of the 15A fuses via the relay.
No more blinking lights and the headlight is noticeably brighter. The ignition switch no longer has a heavy current to deal with and should last much longer.
