Speed four neutral light problems

Hi All new to this forum,

I am trying to sort out my sons speed four.

The neutral light does not work. I have checked the switch, and the bulb in the clocks they are fine, I understand there is a diode in the system somewhere but don't know where it's to be found, I also don't have a wiring diagram so that doesn't help much either,

There is no obvious chaffing or damage to the loom, but I was looking at putting a direct feed in, can anyone tell me which pin in the block connector for the clocks is the one for the signal side of the neutral and confirm the colour of the wire, I believe it should be black with white stripe and where the diode is situated, there's lots of little black boxes on the bugger, things used to be so much simpler

Thanks in advance ... oh and I ride (occasionally) a Triumph scrambler

 

Hi, thanks, but the switch works, and even if i earth the lead to it the light doesnt work, so i know its a problem elsewhere
Brian

 

OK.. just in case anyone has this problem in the future..
the neutral is Green/ orange +ve and Black / white -ve from the switch, turned out to be a bad connection on the circuit board in the clocks and a broken wire in the loom, had the engine management light come on after friggin with all the wiring but its now sorted

 

now ammended to "circuit board", however in your case its more likely to be the switch.