1993 600SEL V12 Battery not charging at idle - Mercedes-Benz Forum
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post #1 of 2 (permalink) Old 07-20-2019, 01:42 PM Thread Starter
BenzWorld Junior Member
Date registered: Nov 2017
Vehicle: 1993 W140 600SEL 12cyl
Location: Gloversville, NY USA
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1993 600SEL V12 Battery not charging at idle

My battery is discharging at idle. When driving the system charges. Today the car was idling and totally discharged the battery. Battery, alternator/regulator, and belts are brand new OEM. I read something about an X4/10? fuse somewhere. Is there a fuse or relay that could be causing this problem. To answer the always electrical question; I have an updated wiring harness and all new coil packs. Thank you
Geoffp1018 is offline  
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post #2 of 2 (permalink) Old 07-20-2019, 04:55 PM
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Date registered: Aug 2016
Vehicle: 1994 S600 Coupe
Location: Northern Alabama
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X4/10 is just a terminal block, no fuse.
Are you sure the system isn't charging, and not a large power draw at idle? You need to have someone check the charging system, using a clamp meter around the charging lead coming from the alternator. Why did you change all of those parts, was the same problem there beforehand?

Also, measure the power draw at the battery, engine off. Disconnect the negative lead, put a VOM with a 10 or 20 amp current setting, and see what the steady state current draw is after a couple of minutes. It should be less than 50 milliamps.

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