cable colours - any electical gurus out there?

[blundering novice]

I've just bought an XR400 and slowly picking my way through the to do list (see post on baffles yesterday!).

Today's job is getting the indicators back on for the MOT. The indicator cables are black and black and white. The wiring on the bike is green (I assume earth) and blue and orange (guess that means trial and error for left and right then). The question is whether black or black and white is earth (or does it matter).

Can anyone point me in the right direction.

Cheers
Andy

[Tarka]

It doesn`t matter in order for the indicators to work,but black should be used as earth and the black/white for positive feed.

Blue and orange are the left/right sdes of the system.

Green is earth.

[blundering novice]

thanks, much appreciated - all wired and working now.