Hi Lankyone - I own a Clio and according to the Haynes manual all earth cables are black or as the french say "noir". I take it is the same for all renaults - unless someone on here can tell me different. Hope this info., is helpful. You having probs with the rear lights?
hi thanks for replies on the rear cluster when taken multiplug off there are 6 wires i have worked out wires 1 2 3 and 5 wires 4 and 6 are both black with wire 4 being thicker than wire 6 just needed a good earth point 4 rear sensors