Wiring diagram for a 13 pin tow bar socket and plug many caravans built after 2008 have the new 13 pin connector for the electrical connections to the car. Note pin 12 is not usually used 12 core cable can still be used to wire this 13 pin plug.

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Tec3m wiring diagram 13 pin. 2 pin 2 in the 12s socket grey 6 pin 6 in the 12 socket grey 4 pin 4 in the 12s socket grey high output combination caravan relay with automatic monitoring and switching of supply from car to caravan through double split charge relays. Take the 13 core cable into the boot through a 916 hole into which you have inserted the grommet provided. You can find other wiring diagrams on this site listed below 7 pin n type trailer plug wiring diagram. Whilst coupling up the 13pin plug to the connector takes a bit of getting used to as it requires a twist connection it does offer a few advantages. 7 way universal bypass relay wiring diagram. Twin electrics is a 2 plug system which combines the single 7 pin 12n electrics socket with a 12s electrics socket.
Split charge relay wiring diagram. Ground wires greenwhite to pin 13 bluewhite to pin 11 white to pin 3. Towbar electrics charge relay tec3m. Needs both 12n and 12s 7 pin sockets but with modified 12s wiring. Tec3m terminals 2 no connection 4 to pin 9 6 to pin 10 of the towbar plug. Wiring info as follows.
Find the vehicle wiring harness and connect the 7 core cable as indicated in chart a using the connectors and earth tags provided. Wiring diagram for a 13pin euro trailer plug. You will need twin electrics if you require more power than what a single 7 pin socket can provide on a pre 2008 manufactured uk caravan post 2008 uk caravans are fitted with 13 pin connectors. Caravan built since 1 september 2008 and some continental caravans particularly if privately imported or commercially imported in small numbers only towcar needs a single 13 pin socket. Converters are available to allow you to convert 7 pin plugs to 13 pin or 13 pin to 7 pin. Fitting instructions for all 13 pin kits and relays.
7 pin s type trailer plug wiring diagram. Mp3813b 2m 13 pin pre wired socket kit with audible monitor and tec3m auto switch dual charging relay contents pre wired 13 pin socket with socket seal nuts screws tem1a audible sensor snap connectors tec3m dual charging relay fuse fuse holder insulated receptors 5m cable and ring terminals. The 7 pin n type 12n plug will still be used on o1 trailers and many towbar fitters will still offer the 7 pin socket as the cheapest alternative. 12v permanent fused live.