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#1
02-14-2009, 08:31 AM
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Charging system question W126
1983 300SD. Charging warning light started flickering, brighter at idle, almost no illumination at 2500 rpms. Started losing headlight power, turn signal strength, etc. on the way home. Got home, battery dead. Charged battery overnight.
This morning: Battery volts with engine off - 12.5 volts. Battery voltage with engine at idle - 14 volts. Charging light still flickering. Cleaned battery posts and terminals, cleaned wiring junction block on frame near alternator. Light on dash still illuminated at idle. Any thoughts? 
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#2
02-14-2009, 08:42 AM
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Alternator or battery. Since you get higher voltage at idle I would imagine it is the battery. You can take it to Autozone (or the equivalent) and get it tested for free.
__________________
2009 ML320 Bluetec 1985 300CD 1981 300TD  Past Mercedes 1979 300TD 1982 300TD 2000 E320 4Matic Wagon 1998 E430 1984 300SD 1980 300SD
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#3
02-14-2009, 08:46 AM
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But it should be higher voltage when the engine is running. 12V systems charge at >13 volts.
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#4
02-14-2009, 08:49 AM
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Have someone start the car as you measure voltage.If it drops below 10.5 volts.You need a battery.
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran
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#5
02-14-2009, 08:58 AM
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The flickering light indicates that there is something wrong with the charging system. IE, the alternator or battery. The simplest thing to eliminate first is the battery. Get it tested for free. Then if it is bad replace it.
Also another simple thing to check is the belts on the alternator. They may be slipping and or loose.
__________________
2009 ML320 Bluetec 1985 300CD 1981 300TD Past Mercedes 1979 300TD 1982 300TD 2000 E320 4Matic Wagon 1998 E430 1984 300SD 1980 300SD
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#6
02-14-2009, 09:45 AM
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The most common cause of the light flickering is worn brushes in the alternator's voltage regulating system. Easy job to replace it - used to cost about $30 for the whole thing, may be more now. Some here have changed the brushes themselves, if that is the way you go, do a search to find out where to get the brushes and how to do the job. Jim
__________________
Own: 1986 Euro 190E 2.3-16 (291,000 miles), 1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000, 1988 300E 5-speed 252,000 miles, 1983 240D 4-speed, purchased w/136,000, now with 222,000 miles. 2009 ML320CDI Bluetec, 89,000 miles Owned: 1971 220D (250,000 miles plus, sold to father-in-law), 1975 240D (245,000 miles - died of body rot), 1991 350SD (176,560 miles, weakest Benz I have owned), 1999 C230 Sport (45,400 miles), 1982 240D (321,000 miles, put to sleep)
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