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Old 05-09-2002, 08:01 AM
Registered User
Join Date: Jan 2001
Location: Naperville, IL
Posts: 32
abs light, weird buzzing noise, dead!

94 E 420 105K. running fine, though lately it takes a second crank to start from overnight cold. Car ran fine all day. On last run of the day, ABS light comes on from the start , accompanied by strange buzzer/warning sound I have never heard before..the sound itself sounded like there was an intermitent in the buzzer. Pull off into a parking lot, shut off car. Tried to start car, wouldn't turn over. Battery appears good, all lights, etc work. Had car jumped by AAA, nothing. Towed to Merc dealer, where the car sits this morning.

There's no OVP as far as I can tell by reading this forum, in 90's V-8's? What is going on?
John Pazdan
94 E420
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Old 05-09-2002, 05:55 PM
G-Benz's Avatar
Razorback Soccer Dad
Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
Alternator...probably internal voltage regulator or alternator diode went bad.

In any event, the earlier ones were component-replaceable. You may be looking at having to replace the entire alternator.

A charging system check would tell you a lot. With engine running and all non-essential accessories off, a check at the battery terminals should produce 13.5 - 14.4V. Outside of that range indicates a problem.

I replaced my alternator last year when I saw (and smelled) the battery venting...voltage output was 17.5V!!!

Dealer will charge $500 or more to replace the alternator...if you buy the part at FastLane, it's a DIY job at $250.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car
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Old 05-11-2002, 09:00 AM
Registered User
Join Date: Jan 2001
Location: Naperville, IL
Posts: 32
problem solved for $30 at dealer

took the car to Laural Mercedes in Westmont Il..mechanic John Kostal replaced fuse #5..that was it. As they also hand wash the car there, which is about $25 where I live...I think the service was really $5.

anyway, i highly recommend Laural..they could have jacked up the bill with a charging system check, etc for a lot more $$..but they didn't . as a new merc owner, i also found out about the 24 hour road service, which I had assumed was only for original owners, but extends to all owners.
John Pazdan
94 E420
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