Battery warning light 1987 4210sel

1979-1991 280SE, 300SE, 300SEL, 380SE, 380SEL, 380SEC, 420SE, 420SEL, 420SEC, 500SE, 500SEL, 500SEC, 560SEL, 560SEC
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Model you own: w126

Battery warning light 1987 4210sel

Post by Davgolla » Mon 22 Jan, 2018 5:21 pm

Hi all...Knowledge /guidance requested.....battery warning light stays on at idle. Goes out as accelerate and at usual cruising speeds. Fairly new/full strength battery( 3.5 years old).

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Mercedes Demigod
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Joined: Sat 12 May, 2007 2:21 pm
Model you own: w204
Location: Melbourne

Re: Battery warning light 1987 4210sel

Post by Ivanerrol » Mon 22 Jan, 2018 6:19 pm

Consensus would be that your alternator regulator is near kaputt.

It's an easy change - back of the alternator.

If you have a multi-meter then measure the voltage across your battery at idle. Should be over 14 volts.

Ring the forum sponsor - MB spares to get a new one - they are cheap.
it's an easy DIYer.
here is the video :
The brushes on the regulator wear down with age.
W211 - E240
W204 - C280
W202 - C200, C180, C180
W126 - 380SE , 380SE (Ex SA Import), 560SEL
W124 - 300e, 260e (ex Japan)
W111 220s (Indonesia) 4 speed manual column shift
W123 230
W116 450SEL
W140 420SEL
W210 E240, E240
W209 CLK 240
W201 190e 2.6 (ex U.K.)

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