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| TF1013 Three Lamp Bypass |
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This device incorporates two relays.
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| The two 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. |
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Typical Applications
To switch the two side lamps (separately) and the brake lamps (together) |
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It has three wires for connection to the vehicle loom: Red/white for brakes, Black/white for LH tail, Brown/white for RH tail, and an earth wire.
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| Connection to the trailer 7-core cable and to the wire bringing power from the battery is made by screw connectors. |
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| Fuse: 10 amps |
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| Refer to the General Instructions and Chart A in the section 12N Wiring before following these instructions. |
| Connect the 7-core cable as follows: Brown
and black to terminal 5/7; red to terminal 6. |
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| Connect white to a good chassis earth. |
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| Bring a reliable power lines (1.0mm²) from the vehicle battery to the power terminals +12v. Fuse this cable close to the battery using a 10amp fuse. |
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| Do not connect to the battery or insert the fuses until the rest of the installation is complete. |
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| 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 |
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| Connect the fog lamp circuit (7-core blue) using a fog cut out relay if appropriate. 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. |
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TF1013 Three-lamp Bulb-failure Bypass |
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Because these are basically simple relays, there is very little about them to cause confusion or problems.
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| Operation |
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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.
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| How these relays work. |
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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.
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| Installation checks |
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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 |
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