side lights and MOT

My car is in for MOT next week just noticed the front side lights, one is
50% brighter than the other. First would this fail the MOT and 2nd anyone
any idea how to fix it
Thanks
John Scott
UK Kent

 

Swap bulbs from side to side. If the dim one moves to the other side check
bulb wattage and replace as necessary. When bulbs get old the glass can get
discoloured.
If the fault stays put, then you have a wiring problem. with the lights on,
measure the voltage on each side of the bulb with respect to the battery
terminals this will tell you which part of the circuit is dropping the volts.
Replace wiring, fuses switches as necessary until you get virtually full
battery volts at the bulb

hth

Bob

 

Thanks for the reply, my main worry before I go to the MOT is will it fail
for the side lights as they are not used for driving
JOHN

 

yes it will fail

 

Thanks to all replies it was the bulb, black and burnt after only `14
months. A halfords own brand, will buy from France next time
Thanks
again