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TEC2M Auto Switch Combi Relay wiring diagram

TEC2M Auto Switch Combi Relay

TEC2M auto switch relay

This relay automatically senses the condition of the towing vehicles alternator and diverts some of the current charging it’s battery to the caravan’s battery or fridge as well. This happens automatically when sensors trigger a split charge relay at a set voltage. This does not require a separate lead from the ignition switch as the switch in the relay is automatic.

It is important to use cables with sufficient stranding to prevent voltage drop as this can stop the relay from functioning. Cable that has a minimum stranding of 35/0.3 (2.5 sq mm) should be suitable for the 12v feed from the battery to the relay. Cable with a minimum stranding of 16/0.2 (0.5 sq mm) should be enough for the earth.

This relay has been designed to handle loads of up to 15 amps.

Below is a wiring diagram for the TEC2M, please click to enlarge it.

TEC2M wiring diagram

To purchase trailer parts and towing accessories please visit towingandtrailers.co.uk


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Comment Pages

There are 7 Comments to "TEC2M Auto Switch Combi Relay wiring diagram"

  • Bill says:

    I had a 25amp relay @ £10, which I fitted 3 years ago. It finally blew out, first noticed when it refused to operate the fridge. I also had 2 spare batterries (72amp + 75amp = 147amp) which I have been using for a rare jump start, on the same split charger. My trailer batterry is a 110amp. A battery salesman told me that I am simply asking to much, and advised a 30amp split charger.

    Is it possible to purchase the above TEC2M @30amps, please?

    If so, could you quote me please.

  • Pete says:

    The 30 amp Version is a TEC3M is a 30amp Version and this costs £13.60. Please call 01909 473749 to order

  • kirk says:

    I have wired my 7S plug exactly as above and still no power going to caravan, does the no 7 wire have to be earthed too ? (not stated in diagram)

  • Stu says:

    Do I still need to earth pin 3 and 7 on splug?

  • Pete says:

    yes you do need an earth on pin 3&7

  • Pete says:

    You actually require an earth on pin 3&7 of your towing socket.

  • Stu says:

    Thanks guys. I’ve already got the light electrics on my car, just adding the aux for charging an the fridge

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