**UPDATED** Under Voltage, Consumer Defective, alternator, help
#77
MBWorld Fanatic!
Thread Starter
i'll post pics of the fix and the "Hooley ground kit" when i/we get around to it.
#78
hello guyes...
my alternator/battery light came on about 1 month ago, took it to the shop they said it was the alternator and the battery. i changed them both for a heavy bill of 1500 dollars. i used to have a honda accord and id get my hands under it with out a problem, with the mb i am affraid of getting under the hood cus people say its too complicated. a week into having the new alternator and battery the alternator/battery light came on again. the ca stalls on me, all the electric shuts down, i have to ask for a bust many time a day. I took it to the shop again and now they are sayng that the alternator is fine and the battery is fine but the STARTER CABLE and the PREFUSE BOX are all coroeded and that to fix it its going to cost 1000 bucks. im desperate i just bought this car 5 months ago. im out of cash and need help. thank you,
oscar
my alternator/battery light came on about 1 month ago, took it to the shop they said it was the alternator and the battery. i changed them both for a heavy bill of 1500 dollars. i used to have a honda accord and id get my hands under it with out a problem, with the mb i am affraid of getting under the hood cus people say its too complicated. a week into having the new alternator and battery the alternator/battery light came on again. the ca stalls on me, all the electric shuts down, i have to ask for a bust many time a day. I took it to the shop again and now they are sayng that the alternator is fine and the battery is fine but the STARTER CABLE and the PREFUSE BOX are all coroeded and that to fix it its going to cost 1000 bucks. im desperate i just bought this car 5 months ago. im out of cash and need help. thank you,
oscar
#79
Super Member
hello guyes...
my alternator/battery light came on about 1 month ago, took it to the shop they said it was the alternator and the battery. i changed them both for a heavy bill of 1500 dollars. i used to have a honda accord and id get my hands under it with out a problem, with the mb i am affraid of getting under the hood cus people say its too complicated. a week into having the new alternator and battery the alternator/battery light came on again. the ca stalls on me, all the electric shuts down, i have to ask for a bust many time a day. I took it to the shop again and now they are sayng that the alternator is fine and the battery is fine but the STARTER CABLE and the PREFUSE BOX are all coroeded and that to fix it its going to cost 1000 bucks. im desperate i just bought this car 5 months ago. im out of cash and need help. thank you,
oscar
my alternator/battery light came on about 1 month ago, took it to the shop they said it was the alternator and the battery. i changed them both for a heavy bill of 1500 dollars. i used to have a honda accord and id get my hands under it with out a problem, with the mb i am affraid of getting under the hood cus people say its too complicated. a week into having the new alternator and battery the alternator/battery light came on again. the ca stalls on me, all the electric shuts down, i have to ask for a bust many time a day. I took it to the shop again and now they are sayng that the alternator is fine and the battery is fine but the STARTER CABLE and the PREFUSE BOX are all coroeded and that to fix it its going to cost 1000 bucks. im desperate i just bought this car 5 months ago. im out of cash and need help. thank you,
oscar
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CaliBenzDriver (05-08-2019)
#80
thank u. i like to stay positive and hope i get to the bottom of this problem. its cost me time, money, and alot of lost time from work. I spoke to the mechanic at Ray Catena he said that if im on a budget then he'd clean the starter connectors with baking soda, and thats the best he could do. I have been looking for answers about the FUSE BOX, but i dont find anything, and about the STARTER CABLE. nothing either. i dont want to touch the car and leave it in worse conditions
thanks for your advise ill try to get dirty on this C240.
thanks for your advise ill try to get dirty on this C240.
#81
MBWorld Fanatic!
Thread Starter
thank u. i like to stay positive and hope i get to the bottom of this problem. its cost me time, money, and alot of lost time from work. I spoke to the mechanic at Ray Catena he said that if im on a budget then he'd clean the starter connectors with baking soda, and thats the best he could do. I have been looking for answers about the FUSE BOX, but i dont find anything, and about the STARTER CABLE. nothing either. i dont want to touch the car and leave it in worse conditions
thanks for your advise ill try to get dirty on this C240.
thanks for your advise ill try to get dirty on this C240.
#82
Undervoltage consumer defective
On any healthy 12V automotive system the voltage will run at 13.8-14 volts. My son has a car that we bought cheap because of a charging problem that the previous owner gave up on. They installed a new battery and a new alternator but still had issues. Sometimes it was low then way too high and after another alternator it was doing the same thing. Turned out that the problem was a loose post on the starter solenoid where the lead from the alternator was attached. Took it all apart, tightened everything and it has been putting out a steady 13.8-14 for the last two years and no more issues.
Thanks for your post, I solved my problem by reading your post,similar problem😀😀😀😀
#83
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MY'14 W212 M276 3.5NA @60kMi
low charge voltage from BAD GND....
I have the same low voltage problem on a E350 W212 MY'14. Many years later Benz still failed to improve on this perfect PITA profit center.
I don't think a tiny 14AWG wire can ground the 120Amp starter current... so that kind of tells us the engine power ground is mostly OK. Problem may be a GND DISTRIBUTION issue but elsewhere: like a GND reference for computer or alternator or a SAM that measure wrong floating values...
I don't know if this ALTERNATOR is rubber insulated and has or needs a GND strap (Seen that exact problem on Porsche alternator with a missing GND strap)
Also the "smart charging" alternator is controlled by the main computer... to go between 12.6 to 14.9 based on engine coasting.
I've seen my new car at 3KMiles purposely draining its battery while cruising at freeway speed courtesy of this "genius" alternator control: showing "11.9V @ 90A" on cluster display !!
EDT2: traced to CAN modules faulty from factory impacting Alternator with low-charge command.
I don't think a tiny 14AWG wire can ground the 120Amp starter current... so that kind of tells us the engine power ground is mostly OK. Problem may be a GND DISTRIBUTION issue but elsewhere: like a GND reference for computer or alternator or a SAM that measure wrong floating values...
I don't know if this ALTERNATOR is rubber insulated and has or needs a GND strap (Seen that exact problem on Porsche alternator with a missing GND strap)
Also the "smart charging" alternator is controlled by the main computer... to go between 12.6 to 14.9 based on engine coasting.
I've seen my new car at 3KMiles purposely draining its battery while cruising at freeway speed courtesy of this "genius" alternator control: showing "11.9V @ 90A" on cluster display !!
EDT2: traced to CAN modules faulty from factory impacting Alternator with low-charge command.
yah its just temporary. i'm gonna have hooley build me a legit super grounding kit in the next week or so. i'm still down a tiny itty bit of voltage when driving (it sometimes drops to 13.5 if i'm driving for a while)....but i no longer have a longer cranking period if car isn't driven for a little while and voltage no longer gets below 12 or 13....stays between 13.8 and 14.2 or so while driving.
Last edited by CaliBenzDriver; 05-20-2019 at 06:58 PM. Reason: high maintenance chaos
a6, alternator, amg, audi, battery, c32, consumer, defect, emissions, error, intercooler, mercedes, pump, replacement, undervoltage, wet
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