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2003 Mercedes E320 Serious battery drain. Battery is

Customer Question
2003 Mercedes E320 Serious battery drain...
2003 Mercedes E320
Serious battery drain. Battery is draining within in hours after being fully charged.
Submitted: 6 months ago.Category: Mercedes
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Answered in 8 minutes by:
11/3/2017
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Mercedes
Satisfied Customers: 5,334
Experience: Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic vehicles
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Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

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Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 6 months ago

Hey how are you

we need to have it scanned using a Star Mercedes scanner to retrieve fault codes and to see which module not communicating

now if no scanner available ,we can try method below

now battery needs checked under load for holding 12 volts and battery scaleless for loose or corroded battery side and starter side then do this

now with said abs pump module are common for drain but testing is needed

Battery Drainage Test

1- Voltmeter
2- settings on voltmeter will be on milli amps.
3- go across all the fuses in the car and see which one is reading higher than 0.3 to 0.5 milli amps
4- the fuse drawing more than 0.5 miili amps ,will be the suspected circuit that needs inspection for the drainage.

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Chad Farhat
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Chad Farhat
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Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Mercedes
Satisfied Customers: 5,334
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Experience: Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic vehicles

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