I've already figured out the two Gs are for the alternator & the +B is for the (positive) battery but I'm unsure what the L & C are for. My best guess is, L for the Light and C is for the switched live i.e. Control.
But it could just as easily be L for the switched Live and C for the Control light
These things seem delicate enough without mis-connecting & blowing it up on the first application
Cheers,
Andy B