2012 w204 c250 NEED HELP!!!!
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2012 w204 c250 NEED HELP!!!!
Hopefully someone can help me , my c250 developed electrical issue , has no power unless connected to a jump box when i go to turn the car over it just clicks once and the car electronics flash and reset . Doesnt have a check engine light and nothing showing on the dash . Car has had starter , starter relay and alternator replaced and still doesnt get power on its own .
Last edited by eurocarguy101; May 2, 2026 at 10:58 PM. Reason: Forgot to add title
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Hopefully someone can help me , my c250 developed electrical issue , has no power unless connected to a jump box when i go to turn the car over it just clicks once and the car electronics flash and reset . Doesnt have a check engine light and nothing showing on the dash . Car has had starter , starter relay and alternator replaced and still doesnt get power on its own .
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From: MA Coast
W204 2010 C300 4matic Sport M272
With a multimeter check the voltage at the battery terminals.
So even with the battery booster hooked up the engine doesnt turn over? I recently had a dead battery and when trying to start the car with my battery booster it failed to turn over, I had to turn on the "boost" function on the booster pack then it started. With that battery I would hook it to my charger and it would say its fully charged after awhile only to see the voltage plummet when just unlocking the car with the remote. I have a bluetooth battery monitor where i can see the battery voltage at the terminals.
Do you have jumper cables to try jumping off another running vehicle?
I have an inexpensive battery tester that is fairly accurate in testing the battery for state of health and state of charge.
I also have a Noco 5amp battery charger i'd hook up to see if i can charge the battery.
So even with the battery booster hooked up the engine doesnt turn over? I recently had a dead battery and when trying to start the car with my battery booster it failed to turn over, I had to turn on the "boost" function on the booster pack then it started. With that battery I would hook it to my charger and it would say its fully charged after awhile only to see the voltage plummet when just unlocking the car with the remote. I have a bluetooth battery monitor where i can see the battery voltage at the terminals.
Do you have jumper cables to try jumping off another running vehicle?
I have an inexpensive battery tester that is fairly accurate in testing the battery for state of health and state of charge.
I also have a Noco 5amp battery charger i'd hook up to see if i can charge the battery.
