5 Pin Trailer Plug To 4 Pin. Select another one or two products to compare. If the trailer plug and socket are correctly wired up and connected to the vehicle, then the lights on the vehicle would also not be working if a fuse was blown.
A colour coded trailer plug wiring guide to help you require your plugs and sockets.
Blue = Electric Brakes or Hydraulic Reverse Disable (See Blue Wire Notes.
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I just do not see the justification for them. If the trailer plug and socket are correctly wired up and connected to the vehicle, then the lights on the vehicle would also not be working if a fuse was blown. You'll need a fan that uses a molex connector, you can plug them directly to the power supply.