01 c240 charging sys problem
Thread Starter
Joined: Feb 2008
Posts: 3
From:
01 c240 charging sys problem
hello to all im new here and am a new MBowner
i purchesed a 2001 c240 3 mounths ago2 mounths agothe vehicle stated draning the battery
the battery and alt light started coming on. i took the car to the local parts store and had the
battery tested. test stated bad battey, replaced the battery, 6 days later the vehicle would not start again. took the car back to the parts store and had the battey tested again, battery
test states bad battery. replaced battery. this has gon on for 5 weeks. replaced 4 batterys
had the alt tested the alt tested bad, test results 13.4volts out put 0 amp's out put.replaced the alt. with theREBUILT ALTand new battey
i took the vehciel in to have the charging sys test in full, shop states normal operation
note;;; the worning light in the massage center is still on all the time. the shop i took the vehciel to stated that my alt was not charging at idle but was charging at 1500. rpm and tested good??? i dont know..? does any body have any idea what could be killing my battery now.
i purchesed a 2001 c240 3 mounths ago2 mounths agothe vehicle stated draning the battery
the battery and alt light started coming on. i took the car to the local parts store and had the
battery tested. test stated bad battey, replaced the battery, 6 days later the vehicle would not start again. took the car back to the parts store and had the battey tested again, battery
test states bad battery. replaced battery. this has gon on for 5 weeks. replaced 4 batterys
had the alt tested the alt tested bad, test results 13.4volts out put 0 amp's out put.replaced the alt. with theREBUILT ALTand new battey
i took the vehciel in to have the charging sys test in full, shop states normal operation
note;;; the worning light in the massage center is still on all the time. the shop i took the vehciel to stated that my alt was not charging at idle but was charging at 1500. rpm and tested good??? i dont know..? does any body have any idea what could be killing my battery now.
Junior Member
Joined: Jan 2008
Posts: 9
From: Spain
RE: 01 c240 charging sys problem
Hi Clay,
Welcome to the W203 C240 club as we are unique. With our home computers we have Plug and Play,When we insertthe C240 Ign key, it should be Plugand Pray. First your alternater should charge at idle especially if the battery is down, that's why they got rid of generators years ago. I assume the person who changed the battery knewthere is only one procedure to disconnect the battery on these cars and if this is not done correctly youmay have expensive problems, I am told it usuallyblows the SAM in the rear fuse box. It's in the owners manual. I can only suggest an old method to test battery drain which works for me when I checked evrything else. With the ignition key out and everything else switched off, doors shutetc, put an ampmeter between the battery negative post and battery negative cable. The ampmeter is polarity concious so should be connected the right way round.Holdone end of the ampmeter cable on the negative post and other ampmeter cable on the negative clamp so that when you remove the clamp from the terminal you do not have an open circuit. This will keep the circuit closed and you will not have to reset everythingwhen youreconnect. You will then be able to read any battery drain on the ampmeter. There may be a small drain just for the alarm. If there is a large drainshowing, go to the fuse boxe and pull out each fuseone at a time.Guess what ! there is more than one fuse box,I believe there are 3,one in the trunk, one at the end of the dash drivers side, to access open door and pull out coveron end of dashand one under the hood, drivers side in front ofthe windscreen, LHD vehicles. When you pull the fuse on the circuit which is causing the drain you will see the meter go to zero Then you will have to decide whether you can fix it youself or call in an Auto electrician. Also there is no point in testing a battery when it is flat, your local store should put it on charge for 24 hours and then test it.
Hope this helps.
Colinspain
Welcome to the W203 C240 club as we are unique. With our home computers we have Plug and Play,When we insertthe C240 Ign key, it should be Plugand Pray. First your alternater should charge at idle especially if the battery is down, that's why they got rid of generators years ago. I assume the person who changed the battery knewthere is only one procedure to disconnect the battery on these cars and if this is not done correctly youmay have expensive problems, I am told it usuallyblows the SAM in the rear fuse box. It's in the owners manual. I can only suggest an old method to test battery drain which works for me when I checked evrything else. With the ignition key out and everything else switched off, doors shutetc, put an ampmeter between the battery negative post and battery negative cable. The ampmeter is polarity concious so should be connected the right way round.Holdone end of the ampmeter cable on the negative post and other ampmeter cable on the negative clamp so that when you remove the clamp from the terminal you do not have an open circuit. This will keep the circuit closed and you will not have to reset everythingwhen youreconnect. You will then be able to read any battery drain on the ampmeter. There may be a small drain just for the alarm. If there is a large drainshowing, go to the fuse boxe and pull out each fuseone at a time.Guess what ! there is more than one fuse box,I believe there are 3,one in the trunk, one at the end of the dash drivers side, to access open door and pull out coveron end of dashand one under the hood, drivers side in front ofthe windscreen, LHD vehicles. When you pull the fuse on the circuit which is causing the drain you will see the meter go to zero Then you will have to decide whether you can fix it youself or call in an Auto electrician. Also there is no point in testing a battery when it is flat, your local store should put it on charge for 24 hours and then test it.
Hope this helps.
Colinspain
Thread Starter
Joined: Feb 2008
Posts: 3
From:
RE: 01 c240 charging sys problem
JUST WANTED TO TELL EVERYONE WHAT I FOUND OUT ON FRIDAY.. THE REBUILT ALT THAT I
GOT FROM AUTO ZONE WAS BAD. I TOOK THE ALT OFF THE VEHICEL AND GOT A SECOUND
ALT FROM AUTO ZONE..... GUESS WHAT THE SECOUND ALT WAS BAD TO.. NEEDLESS TO SAY
I WAS VERY UPSET!! I GOT ALL MY MONEY BACK FOR THE BATTERY AND ALT. SO AFTER ALL THATI WENT AND GOT A BOSCH ALT IT WORKED RIGHT THE FIRST TIME. I CHECKED TO SEE IF THERE WAS ANY FURTHER BATTERY DRAINWITH THE AMPMETER. NO DRAIN FOUND. THANKS FOR YOUR HELP!!!
I HAVE JUST ONE MORE THING TO ASK. THIS VEHCIEL THINKS THE DOOR IS OPEN WHEN IT IS NOT AND IT ONLY THINKS THAT IT IS OPEN WHEN YOU ARE DRIVING DOWN THE ROAD
EVEN WHEN ALL THE DOOR ARE LOCKED IT THINKS THE PASS SIDE FRT DOOR IS OPEN.
THE ALARM WORKS PROPERLY AND THE VEHILE GO'S TO SLEEP NO LIGHT STAY ON LIKE WOULD HAPPEN IF THE DOOR WAS REALY OPEN. ANY ONE HAVE A IDEA WHAT COULD BE WRONG?
GOT FROM AUTO ZONE WAS BAD. I TOOK THE ALT OFF THE VEHICEL AND GOT A SECOUND
ALT FROM AUTO ZONE..... GUESS WHAT THE SECOUND ALT WAS BAD TO.. NEEDLESS TO SAY
I WAS VERY UPSET!! I GOT ALL MY MONEY BACK FOR THE BATTERY AND ALT. SO AFTER ALL THATI WENT AND GOT A BOSCH ALT IT WORKED RIGHT THE FIRST TIME. I CHECKED TO SEE IF THERE WAS ANY FURTHER BATTERY DRAINWITH THE AMPMETER. NO DRAIN FOUND. THANKS FOR YOUR HELP!!!
I HAVE JUST ONE MORE THING TO ASK. THIS VEHCIEL THINKS THE DOOR IS OPEN WHEN IT IS NOT AND IT ONLY THINKS THAT IT IS OPEN WHEN YOU ARE DRIVING DOWN THE ROAD
EVEN WHEN ALL THE DOOR ARE LOCKED IT THINKS THE PASS SIDE FRT DOOR IS OPEN.
THE ALARM WORKS PROPERLY AND THE VEHILE GO'S TO SLEEP NO LIGHT STAY ON LIKE WOULD HAPPEN IF THE DOOR WAS REALY OPEN. ANY ONE HAVE A IDEA WHAT COULD BE WRONG?
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