Earth Connections. One earth wire coming from the power inlet must go directly to the chassis and be connected with a Bolt, Nut, and a Spring washer. A second earth wire should then go to all power points, hard wired appliances, and any lights with an earth connector. The wire should be at least 2 and is normally green or green/ yellow.[PDF] SUPREME AND LEADER CARAVANS HAVE SPECIFIC WIRING WIRING DIAGRAM PIN NO. DESCRIPTION CABLE COLOUR CABLE COMMENTS 1 Left Hand Indicator Yellow ECA3 1 2 Reverse Signal/AUX Black ECA3 1 3 Earth Return White ECA5 3 4 Right Hand Indicator Green ECA3 1 5 Service Brakes Blue ECA5 3 6 Stop Lights Red ECA3 1 7 Clearance/Marker Lights Brown ECA3 1 8 Spare