This grey 12 'S' Trailer & Caravan Plug is a replacement for the supplementary electrics on a caravan hence the term 'S' plug.

This allows the caravan to be wired to the car for the purpose for running the fridge and charging the leisure battery while on the move to your holiday destination.

When wiring this replacement the following guide may be useful:

• Pin 1 - Yellow - reversing lamps
  
• Pin 2 - Blue - battery charging
  
• Pin 3 - White - earth return
  
• Pin 4 - Green - power supply
  
• Pin 5 - Brown - spare
  
• Pin 6 - Red - fridge
  
• Pin 7 - Black - earth return