Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

 
 
LinkBack Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #14  
Old 01-07-2010, 02:05 AM
Moderator
 
Join Date: Jul 2001
Location: Woolwich, Maine
Posts: 3,598
Odd when that much time goes by and there are some long time unanswered questions in the thread. Like the two guys with failing alternators (or voltage regulators) who have multiple lights on until they get up to speed.

If you notice, when the car is electrically powered by the battery - engine not running - all the lights are lit with key turned to the run position. When the alternator and voltage regulator take over, the lights go out, unless there is a specific problem to report or, in the case of the high beam indicator, you turn the high beams on. When the brushes in the voltage regulator get worn they make relatively poor contact with the commutator (rotor) and add a higher resistance to the charging circuit. This reduces the voltage below the level where the dash lights want to come on because they "think" the engine is not running. Initially, at higher rpm the alternator puts out a higher voltage at the commutator and enough voltage will make it to the other side to dim the lights, or even shut them off. As the wear continues the lights come on brighter and don't fade out as rpms increase, until they stay fully lit all the time and your radio shuts off and the headlights fade out.

The point is they are not providing any indication of a brake or other problem described in the little icons that light up - it is a sign the regulator brushes are failing and that you should replace the brushes or install a new voltage regulator.

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)
Reply With Quote
 

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 05:43 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page