Headlight

[RobbieRat]

Sounds like a contact problem to me, i'd spray some contact cleaner into the headlight plug or WD40 if you don't have contact cleaner.

You can check the plug for power with a test light, a homemade one will do the trick.(Any 12 volt globe and 2 wires held to it(preferable soldered)
The 3 wires are power for hi and low beam and one for earth the thickest is highbeam and black or white for earth.
I'd also try a new earth conection too and its as simple as pushing a bare wire into the back of the plug against the earth wire terminal and then holding it to a bolt or nut on the body but if you get the 2 power wires you'll short out the fuse so be careful there.
Hope this helps!

Cheers Rob