Trailer Lamps: Description and Operation

TRAILER AUXILIARY SOCKET

CIRCUIT OPERATION

Accommodation within the system has been made for the addition of a trailer lighting system to consist of 2 side lamps, 2 fog lamps, 2 reverse lamps, 2 brake lamps, 1 LH indicator and 1 RH indicator. In addition to these loads, there is also a provision for a 10 amp battery feed to the trailer.

Bulb Failure Diagnosis With Trailer
The diagnosis of external bulb failures will be modified by the presence of a trailer as follows:

Brake lamps
- Diagnosis of the RH vehicle and trailer lamps will only detect a failure of all the filaments.
- Diagnosis of the LH vehicle brake light is unaffected.

Rear side lamps
- Diagnosis of the LH rear side lamps will only detect the failure of both the vehicle filament and the trailer filament.
- Diagnosis of the RH rear side lamps will only detect the failure of both the vehicle filament and the trailer filament.

Reverse lamps
- Diagnosis of the RH vehicle reverse light and the LH and RH trailer reverse lamps will only detect failure of all of the filaments.
- Diagnosis of the LH vehicle reverse light is unaffected.

Fog lamps
- Diagnosis of the RH vehicle rear fog light and the LH and RH trailer fog lamps will only detect failure of all of the filaments.
- Diagnosis of the LH vehicle rear fog light is unaffected.

Direction indicators




The indicator warning lamp and trailer warning lamp will diagnose the status of the vehicle s rear filaments, and trailer direction indicator filaments according to the above table.

In the case of hazard light operation with trailer lamps fitted, the failure of a trailer direction indicator light will cause the trailer warning light to flash at double rate, while the direction indicator light will flash at the "standard" rate.