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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 12-24-2001, 04:09 AM
Village Idiot
Guest
 
Posts: n/a
Is my alternator bad?

I have had the alternator checked twice on my 85 Euro 190E 2.3 16V - they say it's ok. I have tested the voltage at the battery when the car is at idle - 12.5 volts. When I drive the car, the voltage stays at 12.5 for a while, then intermittently drops to 10V, then returns to 12.5V. (I recently bought a LCD voltage meter that plugs into the cig lighter so that I could see the erratic voltage when I drive the car.)
Is my alternator bad or do I need a voltage regualtor (I suspect a bad regulator would show over 14.5V being produced. Could it be a loose connection? Any advice would be greatly appreciated.

M. Rossi
pirltd@yahoo.com
Reply With Quote
  #2  
Old 12-24-2001, 08:04 AM
ymsin's Avatar
Driver, Mercedes-Benz
 
Join Date: Feb 2001
Location: Malaysia
Posts: 1,645
You would know its bad when the battery don't charge and the noise runs you up your wits.
__________________
... Kerry

126 tailed by a 203, 129 leading the pack.
Reply With Quote
  #3  
Old 12-24-2001, 02:05 PM
Registered User
 
Join Date: Jul 2000
Location: Toronto, CANADA
Posts: 1,193
The brushes inside the alternator could be wearing down. It is a fairly simple job to replace them and much cheaper than a new alternator. I had mine done this time last year when I had similar problems to yours. No problems since.
__________________
Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired
Reply With Quote
  #4  
Old 12-26-2001, 01:07 PM
Registered User
 
Join Date: Jun 2001
Location: California
Posts: 324
My 300E had the same problem. The alternator bench tested as being good, but the battery was not charging. When I replaced the alternator my problems were solved. It is probably an intermittent problem caused by worn brushes as 420SEL indicated. Since my wife drives the car and hauls the kids around in it, I went with a new alternator versus fixing the old one.
__________________
D.H.

04 ML500
02 E430

Experience is something you don't get until just after you need it.
Reply With Quote
  #5  
Old 12-26-2001, 09:13 PM
Village Idiot
Guest
 
Posts: n/a
Well, thanks for all of the advice from you guys. The problem turned out to be corroded contacts on the alternator. I have had this recurring problem with other contacts on my car. Runs like a champ now.

mrossi
Reply With Quote
  #6  
Old 12-27-2001, 01:05 AM
ymsin's Avatar
Driver, Mercedes-Benz
 
Join Date: Feb 2001
Location: Malaysia
Posts: 1,645
Well done!


How much did the parts cost you?
__________________
... Kerry

126 tailed by a 203, 129 leading the pack.
Reply With Quote
  #7  
Old 12-27-2001, 04:02 PM
Village Idiot
Guest
 
Posts: n/a
Parts cost me nothing. I unplugged the alternator and sanded the contacts. I have had to do this to alot of the relays in my car also.

mrossipir
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 01:50 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page