Question about 1998 Mercedes-Benz C-Class

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Charging system as i was driving he battery charge indicator light came on. we stop the car and check terminals okay. then we try start the car not cranking. we aited abt ten minutes and car started , wedrove and came home

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  • vvking Jun 30, 2008

    thank u i will try this and let you know

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The regulator pack on the alternator has given up, some call it the brush pack also, the regulator is about £10, you will need to rmove the alternator to replace the reg pack, easy job, once fitted with the engine running check the voltage, should be 14.2 volts.

jib

Posted on Nov 24, 2008

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Sounds like your alternator stopped working on you. A quick test is to start the car and while it's running remove the NEGATIVE battery cable. If it stays running the alternator is still good, if it quits the alternator needs to be replaced. Take a peek at the wires coming off of the back of the alternator and make sure you have to broken wires.

Posted on Jun 29, 2008

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Battery light will not go off


I am posting a generic reply to the "charge fail" lamp (that is the correct term - when the lamp is lit = the battery is NOT being charged) problems rather than a specific cure for the ills in your car.

I suspect a faulty alternator OR an inadvertent short to battery - potential of the wire leading from the charge fail lamp to the battery charging alternator. Please try the following tests (BE CAREFUL while working - you are working near the engine + v belts + fans etc. and a fully charged battery = can be very dangerous)

Locate the three terminals of the battery charging alternator. The largest terminal would be connected to the battery positive cable (may be red in colour). The second terminal could be labeled as "W" = this is the terminal generating a frequency proportional to the engine speed for the tachometer. The third terminal is the WL or D terminal. The Charge Fail lamp is connected from battery positive (via the ignition switch) to this WL/D terminal.

Turn the ignition switch on but don't start the engine. Observe the "Charge Fail" lamp glowing in the dashboard. Now remove the wire going to the WL/D terminal. The "Charge Fail" lamp should now stop glowing. If the lamp continues to glow, there is surely a shortcircuit between the wire from the lamp to the alternator.

As this lamp current is not going to the WL/D terminal due to the short circuit, the battery charging alternator is not producing very little or no output. Check if the battery terminal voltage rises when the engine is running. If the alternator is working correctly, the battery would be at 13.2 Volts with the engine running.

The confirmatory test is to rig a spare lamp (12V, 3 or 5 watt lamp in a holder) between battery + to the WL/D terminal - if that works properly (lit when the engine is stopped and off when the engine ir running), you can connect a new wire from the lamp to the WL/D terminal - do isolate the earlier wire completely from from lamp as well as alternator end.
Hope this helps. Write back if I have confused you further.....

Apurva from Pune, India.

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