Fog Lamp Sensor Circuit diagram . For several years now, a rear fog lamp has been mandatory for trailers and caravans in order to improve visibility under foggy conditions.
Fog Lamp Sensor Circuit diagram :
Fog Lamp Sensor Circuit Diagram
Here a type P521 opto coupler detects whether the fog lamp of the caravan or trailer is connected. If the fog lamp is switched on in the car, a current flows through the caravan fog lamp via diodes D1 and D2. This causes the LED in the opto coupler to light up, with the result that the phot otransistor conducts and energises the relay via transistor T1. The relay switches off the fog lamp of the car.
For anyone who’s not all thumbs, this small circuit can easily be built on a small piece of perforated circuit board and then fitted somewhere close to the rear lamp fitting of the pulling vehicle.
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