Lowbeam issue
Thread Starter
Newbie
Joined: Jan 2024
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2014 C300 4MATIC Sport
Lowbeam issue
Happy near year all, my driver-side aftermarket low beam keeps going out ~10 seconds after turning the car on. I switched the bulbs, replaced the ballast, switched the fuses, and added dielectric grease on all the connections and the driver-side light keeps going out. Any ideas?
MBWorld Fanatic!
Joined: Aug 2023
Posts: 3,576
Likes: 1,065
From: MA Coast
W204 2010 C300 4matic Sport M272
Posting what exact aftermarket low beam youre talking about would help. Did you replace the entire headlight or just the bulbs?
I would start switching parts around if it were me. Swap the passenger side ballast to the drivers side then see.
If you turn the light switch off then on again does the light turn on again, or stay off?
I would start switching parts around if it were me. Swap the passenger side ballast to the drivers side then see.
If you turn the light switch off then on again does the light turn on again, or stay off?
MBWorld Fanatic!
Joined: Aug 2023
Posts: 3,576
Likes: 1,065
From: MA Coast
W204 2010 C300 4matic Sport M272
Im going to assume the car came from the factory with regular halogen bulbs and an hid kit is installed at the low beam?
Do the high beams work? Does a low beam out warning show on the dash display when the low beam goes out?
I would inspect all the wiring and look for spliced connections. I installed an hid kit and its all plug and play, no cuttng wires and splicing. Just take the factory harness and connect it to the hid kit.
If you took the ballast and bulb from the working side and installed it on the non-working side and it still does not function properly theres an issue with the wiring, im guessing.
If the car originally came with halogen low beams you can try installing a halogen bulb and see what happens, completely remove the hid stuff.
You can use a multimeter and check for voltage at the cars factory harness. Should be 12v when the lights are on.
I checked the fuse and replay diagram and both headlights seem to be on the same circuit so I dont think thats the issue.
Maybe post some photos of what it looks like in there so i have a better idea what is exactly in there.
Do the high beams work? Does a low beam out warning show on the dash display when the low beam goes out?
I would inspect all the wiring and look for spliced connections. I installed an hid kit and its all plug and play, no cuttng wires and splicing. Just take the factory harness and connect it to the hid kit.
If you took the ballast and bulb from the working side and installed it on the non-working side and it still does not function properly theres an issue with the wiring, im guessing.
If the car originally came with halogen low beams you can try installing a halogen bulb and see what happens, completely remove the hid stuff.
You can use a multimeter and check for voltage at the cars factory harness. Should be 12v when the lights are on.
I checked the fuse and replay diagram and both headlights seem to be on the same circuit so I dont think thats the issue.
Maybe post some photos of what it looks like in there so i have a better idea what is exactly in there.
Thread Starter
Newbie
Joined: Jan 2024
Posts: 8
Likes: 0
2014 C300 4MATIC Sport
Thread Starter
Newbie
Joined: Jan 2024
Posts: 8
Likes: 0
2014 C300 4MATIC Sport
Im going to assume the car came from the factory with regular halogen bulbs and an hid kit is installed at the low beam?
Do the high beams work? Does a low beam out warning show on the dash display when the low beam goes out?
I would inspect all the wiring and look for spliced connections. I installed an hid kit and its all plug and play, no cuttng wires and splicing. Just take the factory harness and connect it to the hid kit.
If you took the ballast and bulb from the working side and installed it on the non-working side and it still does not function properly theres an issue with the wiring, im guessing.
If the car originally came with halogen low beams you can try installing a halogen bulb and see what happens, completely remove the hid stuff.
You can use a multimeter and check for voltage at the cars factory harness. Should be 12v when the lights are on.
I checked the fuse and replay diagram and both headlights seem to be on the same circuit so I dont think thats the issue.
Maybe post some photos of what it looks like in there so i have a better idea what is exactly in there.
Do the high beams work? Does a low beam out warning show on the dash display when the low beam goes out?
I would inspect all the wiring and look for spliced connections. I installed an hid kit and its all plug and play, no cuttng wires and splicing. Just take the factory harness and connect it to the hid kit.
If you took the ballast and bulb from the working side and installed it on the non-working side and it still does not function properly theres an issue with the wiring, im guessing.
If the car originally came with halogen low beams you can try installing a halogen bulb and see what happens, completely remove the hid stuff.
You can use a multimeter and check for voltage at the cars factory harness. Should be 12v when the lights are on.
I checked the fuse and replay diagram and both headlights seem to be on the same circuit so I dont think thats the issue.
Maybe post some photos of what it looks like in there so i have a better idea what is exactly in there.
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