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| TF116 Combination relay, 6 pin type |
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| Relay function: Switches the caravan auxiliary circuits on when the vehicle alternator charges. This relay requires a trigger signal from the alternator or a suitable ignition-switched live. The trigger source must be on when the alternator is charging but off when the starter motor is cranking. |
| Wiring the 12S Socket & connecting to the vehicle: |
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| Socket pin number |
7-core cable colour |
to |
Relay pin |
Vehicle circuit |
| 1 |
Yellow |
to |
N/A |
Reversing light |
| 2 |
Blue |
to |
11 |
Switched live |
| 3 |
White |
to |
N/A |
Chassis earth |
| 4 |
Green |
to |
21 |
Permanent live |
| 5 |
Brown |
- |
N/A |
Spare |
| 6 |
Red |
to |
14 |
Switched live |
| 7 |
Black |
to |
N/A |
Chassis earth |
| Fuse rating: 15 amp (max 20 amp) |
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| General Instruction, 12S installations (Caravan auxiliary circuits) |
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| 1. Drill a 13mm (9/16") hole in the floor of the boot adjacent to the socket mounting point on the towbar. (Take great care to ensure that you drill in a safe place where you will not damage wires, pipes, bodywork, etc.) Treat the edges of the hole with a rust inhibitor and line it with the grommet provided. |
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| 2. Wire the trailer socket, as shown in table above and mount it on the towbar. Lead the 7-core cable into the boot through the hole you drilled. Make sure the seal between the grommet, the cable and the hole on the bodywork is gas tight. |
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| 3. Route your power source cable(s) from the boot to the battery. Fit a fuse in line in the cable, close to the battery. Do not connect yet |
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| 4. If you are providing a trigger wire for your relay, route this at the same time. Your trigger source must be on when the alternator is charging but off when the starter motor is cranking. Connect the trigger wire, making sure that the relay end is connected safely. |
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| 5. Follow the instructions in table above and diagram below and connect together your 7-core cable and your relay. |
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| 6. Note that post 1998 caravans use pins 4 and 2 differently from the way pre 1998 caravans did. If you wire according to these instructions, all caravans will be properly accommodated. |
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| 7. Connect your power cable(s) to the battery and insert the fuse(s) provided. Check that the fuse is of the value shown in table above. |
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| 8. Use a suitable test board to test the circuits. The loads created by the test board must simulate the load created by a caravan fridge (red, Pin 6) and battery (yellow, pin 2 or green, pin 4). Make sure that the relay stays on under load. |
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