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2005 sl600 electrical problems. no radio sometimes no

Customer Question
2005 sl600 electrical problems...

2005 sl600 electrical problems. no radio sometimes no electricity at all when nearing with key

Mechanic's Assistant: Is the key stripped or worn?

No

Mechanic's Assistant: Are you fixing your SL600 yourself? What have you tried so far?

Nothing just started.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Rear battery is newer

Submitted: 8 months ago.Category: Mercedes
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Customer reply replied 8 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 8 months ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 8 minutes by:
11/11/2017
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Mercedes
Satisfied Customers: 5,652
Experience: Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic vehicles
Verified

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 8 months ago

hey how are you ,I will try to help you with this issue

the rear battery could be new but if alternator not charging it it could be our fault or the battery cables ,we need to check with a voltmeter does the new battery has 12 volts in it ,ar the cable loose or corroded

also the small battery is the starter battery how old is that one

is this your daily driver

lets start here and we go from there

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

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Customer reply replied 8 months ago
don't know how old starter battery is. not daily driver. probably 3 time per week.
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

We have to start there ,but it seems the starter battery needs checked also , or at least recharged to check , 3 times per week is not a lot , if we have a small drain on it it will kill it, this a special battery you can buy from dealer or online

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Customer reply replied 8 months ago
is the starter battery charged by the main battery?
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

no they are both charged by the alternator , with a voltmeter , when car is running we need to read 14 volts plus to know the alternator charging them

how many miles on it

2005 Mercedes Benz SL 600 (230.476) V12-5.5L Turbo (275.951)

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Date: July 3, 2012 Order No.: S-B-54. 10/255 Group: 54 SUBJECT: MY-All, All Models Charge Battery Correct charging of the on-board electrical system battery, starter battery, and buffer battery helps to ensure that the vehicle continues to start, functions properly, and has optimal battery life. Therefore please remember that all batteries >/= 12 Ah must be charged in the way described in AR54.10-P-1130CW. The battery charging period depends on the charge level of the battery. The battery must be charged using an approved charger (see SSEP catalogue located under "MB Equipment" menu of STAR TekInfo). The battery is sufficiently charged when the charging current reading is < 25 A.

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

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Customer reply replied 8 months ago
100,000 miles
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

at 100, 000 i do not suspect ,more than battery if every thing was working prior

i say start with battery and recharge the new one and then check alternator charging and go from there

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Customer reply replied 8 months ago
to be clear, the starter battery only starts the car. everything else(radio lights etc runs off main battery) correct?
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

correct

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Customer reply replied 8 months ago
you are saying test main battery. if it is good but not holding a charge it maybe alternator. If it is not holding a charge because it is bad, replace it.
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

yes sir that is exactly correct

the new battery could still be good just empty if the alternator not charging it .

Hope that helps

Thank you

Chad

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Customer reply replied 8 months ago
Ok. I mentioned the key not "waking" the car up. when I get near. But when I put it in the ignition it starts right up. That is probably a bad battery in key?
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago

does is still lock and unlocks

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Customer reply replied 8 months ago
no
Mercedes Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 8 months ago
Then yes on the key battery ,replace , they have at local ports store
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