I JUST TOOK A GUESS...BIT HARD TO KNOW THE WIRING COLOURS THEY DONT MATCH THE COLOUR CODES IN WIRING DIAGRAMS....I HAVE 1 X BLACK WIRE,1 X LARGE BLACK WIRE WITH YELLOW TRACE,AND WHAT SEEMS TO BE 2 X WHITE (OR YELLOW THEY ARE OLD) WITH SEEMS TO BE BLUE TRACE. THERE IS NO ENGINE BLOCK GROUND EARTH WIRE TO THE BLOCK....