I was looking for Hella in Germany. I wanted to ask them for a schematic of the Bulb Failure Sensor so I can modify it for LED tailights.
All I can access is the N.American Company and they can'r help with this. They suggested I try their Europe website and inquire there. Ummmm That site is in German, If some of you over seas can get to that site and get to one of their Customer Service e-mail addresses, can you send this to them?



I own a Volvo that has your Bulb Failure Sensor in it # 5KG 004919-04 Volvo # 1362367. These sensors are used in the Volvo 200,700 and 900 vehicles, that I know of.

I am getting false Bulb Out warnings because of a modification I made to my Brake lights. you see, your device monitors three Brakelights, The Drivers side, the passenger side and the Third brake light in the rear window of the American cars. The right and left Brakelights, I have changed to LED's. What this has done was to make the current sense balance between the two sides uneven since the one side of the Sensor includes the Third Brakelight. After opening this sensor, it looks like reference point SP1 controls the Brakelights. I need to balance the Windings so I can run the very low Current LEDs with the Third light incandescent and not get a Warring light on my dashboard. Is it possible to send me a Schematic of this sensor?
Maybe a Technician can look and make me a Bifilar Coil that will replace the one put into this Sensor for this Brakelight function?
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'75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me