72 220D back on the bench - Mercedes-Benz Forum
 
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post #1 of 6 Old 03-12-2010, 02:59 PM Thread Starter
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72 220D back on the bench

Well, Little Blue is back on the bench with a quite troubling electrical problem. The battery was mysteriously draining, sometimes over night, and sometimes it would last days on a charge. Sometimes it would loose the charge after a trip around the block.

I changed all of the fuses. Then I went searching for a short. I found a chewed up wire that had been connecting with the block. I taped it off and it rand for about a week with no problems, then she died.

I swapped the batteries out and that didnt seem to do it either.

Any thoughts?

ClaytoR
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post #2 of 6 Old 03-12-2010, 03:54 PM
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Are you saying you have nothing i.e. no 12 volts anywhere, or the car has volts and cranking, but won't start?
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post #3 of 6 Old 03-13-2010, 02:01 PM Thread Starter
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it starts and runs great, then the battery mysteriously drains?
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post #4 of 6 Old 03-13-2010, 11:58 PM
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If you live in the US go to Harbor Freight and get a Volt/Ohm (Multimeter). This would tell you if your problem is one of not charging, low charging, or a short.

Also on my newer model if the Low Chargeing Light Bulb is burned out the Alternator is not going to charge as it needs that little bit of resistance to excite the Voltage Regulator.

Next issue is that the Voltage Regulator controls the Field Current throgh the Ground. If the Ground Strap at the Battery or the Ground Strap from the Body to the Engine is not making good contact the Alternator may not charge correctly.

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post #5 of 6 Old 03-14-2010, 06:57 PM
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Brushpack is easy thing i have found this to oh so common and overlooked.Gypsydog

have worked on german cars 30 yrs
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post #6 of 6 Old 03-14-2010, 10:17 PM
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If you live in the US you can get the Battery load tested for free. (The Battery needs to be fully charged before the load test; if you do not do not charge it you will have to leave it there for several hours to be charged.)
If they plates inside of the Battery have been damged or are old the Battery will not hold a charge.

This happen to me: Drove my Car to a Realatives house. When I left there the Engne started fine no charging issures.
Stopped to get something to eat and got in the car and turned the key. Nothing happend; nothing at all.
I had a Multimeter in the car and read 12 Volts. But, when I was checking out the wiring I grounded one of the + wires and got only a weak spark. Not the hot hissing sprak of a good battery.
There was an Autozone acrossed the Street and I bought a new Battery; put it in and the Engine started normal and I have had no problems since.
Something inside of my Battery must have become damaged; that is why it died suddenly.
If you had a short that drained your Battery it could have damged it and it now is not holding a charge. A load test will determing that.
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