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Licence plate lights anomaly

GrahamCoops

New Member
Joined
Feb 11, 2020
Messages
2
Location
Waterlooville
Car
B200
Mercedes B Class 2014 Strange situation with Licence plate lights, both lights not working but both check fine with a 9v battery, voltage at LH connection 12v but light will not illuminate!! (I have tried to connect via leads and crocodile clips) voltage at clips measures 12 volts but will not illuminate the light?!I have tried reversing the polarity! Voltage at RH connection 6.5v(?) any ideas? The lights are the LED closed unit variety.
 
Sounds like a failing led driver - had the same on my LED rear lights, would work fine at 12V (vehicle not running) but would stop working as soon as you started the car - 14V. Only fixed by a new light unit.
 

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