TF1014 Four  Lamp Bypass

This device incorporates a set of three relays.

Typical Application
To switch the two side lamps (separately), the brake lamps (together) and the fog lamp.
The three relays operate independently of each other when switched by the coil input but have a common earth. The side lamp relay has two independent inputs, one from each side of the towing vehicle, so that, should the vehicle sidelamp fuse on one side fail, the trailer sidelights would both remain on.
 
Standard
TF1014
It has four screw terminals: three to accept the trailer lamp wires and one for power input from the vehicle battery.
It has four signal wires for connection to the vehicle's lamp circuits and a ring-terminated earth wire for connection to the chassis.
Fuse: 10 amps
Instructions: Top
Refer to the General Instructions and Chart A in the section 12N Wiring before following these instructions.

Connect the 7-core wires as follows:

Brown AND black to terminal 5/7

Red                         to terminal 6

Blue                        to terminal 2
Connect white to a good chassis earth.
Bring a reliable power line (1.5mm²) from the vehicle battery to the power terminal +12v.
Fuse this cable close to the battery using a 10amp fuse.
Do not connect to the battery or insert the fuses until the rest of the installation is complete.
Connect the signal wires to the loom as follows:
Brown to RH Tail lamp circuit
Black to LH Tail lamp circuit
Red to Brake lamp circuit
Blue to Fog lamp circuit
Connect the flasher circuits following the instructions with the flasher relay you are fitting. When the installation is complete, make the battery connection, insert the power fuses and test the operation.
    TF1014 Four Lamp Bulb-failure Bypass
  


Because these are basically simple relays, there is very little about them to cause confusion or problems.

  
Operation

A basic test to see if they are working properly is as follows.
Connect the power-in wire or terminal to a 12 volt source. Connect the earth wire to a reliable earth. Connect a bulb to each of the designated output wires or terminals in turn and touch the appropriate signal wire to the 12 volt source. The bulb should light.
How these relays work.

Current from the vehicle's lighting circuit is picked up by the signal wires and passes through the electromagnetic coil of the relay to earth. As it does so, it energises the coil; the core of the coil becomes a magnet and pulls the electrical contacts together connecting the power-in wire or terminal directly to the designated output wires or terminals. It only takes 0.038 of an amp to energise each coil: this is why the vehicle does not detect their presence.
Installation checks
That the power source is adequate and constant.
That all connections are good
That you have connected the correct wires and terminals together.
That the signal source is correct