We'll now I seem to have traced my electrical problem to the side light. Turn on the ignition with the light switch off and the side light comes on and flashes in an irregular fashion. Turn the light switch on and no lights come on. ...... I have a feeling that the ignition switch may be a primary area for attention as the switch is very fickle.
I think I'll replace it with a pattern part and see if that works .. I'll also check out the condition of the brown wire running the length of the bike. My rear light and brake light works fine though......
If there are no instrument lights, then it could be the ignition switch or the large white gang connector.
On second thought, the fact that the tail light is OK says that the ignition switch is not the problem. Still ,look at the LWGC.
Before you get too far into it, have a look inside the Yellow gang connector. It is a common problem area on the TL when it comes to lighting. The Yellow/White wire terminal over heats and sometimes causes problems with the other terminals. If nothing there look inside the black connector coming from the right hand switch pod.
Also check the main loom ground connection near the battery. That single spade connector can cause odd things to happen. It easily corrodes - especially in the UK.