7 Core Wire / Cable For Trailer & Caravan Automotive Grade. This listing is forf 7 core trailer wire / cable. Top quality automotive grade cable. Tough external insulation provides extra protection against chafing or rubbing. Each wire is 0.5mm and suitable for up to 4A. INCLUDES THE FOLLOWING COLOURS 1. YELLOW – left hand indicator 2. BLUE – rear fog 3. WHITE – earth return 4. GREEN – right hand indicator 5. BROWN – right tail and number plate 6. RED – stop 7. BLACK – left tail and number plate.