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02 Mercedes cl 500 new alternator after 30 minute stop

Customer Question
02 Mercedes cl 500...

02 Mercedes cl 500 new alternator after 30 minute stop charging

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

If I drive for 30or 040minute from 14.20 drop to 12.50

Submitted: 2 years ago.Category: Mercedes
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Answered in 25 minutes by:
3/3/2016
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 5,887
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
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Hello, where are you testing for voltage at?

does the battery light come on the dash?

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Customer reply replied 2 years ago
No
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

OK , so also i asked where you are testing for voltage at? and what led you to checking the alternator?

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Customer reply replied 2 years ago
Voltage at battery and fuse block passenger side
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, i need you to answer my questions or else we will get nowhere, i asked 2 questions each time and you responded with one answer. i really can help but i need your cooperation to help me understand your scenario so i can give you the best answer and get you fixed up with minimal time spent.

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Customer reply replied 2 years ago
Ok no battery light on dash and check voltage at battery and fuse block at passenger foot wall
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

also where did you purchase the alternator from and did the old one do the exact same thing? the alternator is controlled by the ecm so you may have a faulty ecm or a poor connection.

so WHY did you replace the alternator?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

THE small connector on the alternator should have a blue wire in it, that wire is going from the alternator to the right fuse block then to the sam control module which attaches to the fuse block, it should have 12v at all times when the engine is running.check that wire. make sure the connection is good and the pins are not burnt

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