7 Pin Plug Grey.
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7 Pin plug grey S type:
The 7 pin supplementary grey S type plug was designed for tow bar connection for supplementary internal working of a caravan or trailer tent.
The normal 7 pin plug does not have extra connections to run extra power so an additional plug was designed.
The S plug carries 12 volt electricity for the fridge and for some internal 12 volt appliances.
The fridge connection should be wired by a motor electrician as it carries a heavy load and also wired so that it cannot be inadvertently left drawing power.
The plug should be replaced if it becomes damaged or corroded.