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 08-09-2003, 12:28 AM
Registered User
 
Join Date: Mar 2003
Location: Houston, Texas USA
Posts: 59
300 SD Alternator?

My battery went dead. The local gas station tested my electrical system. They showed me some machine that said my alternator was putting out 11 or 12 volts. They said it should be 13, and that I need a new alternator, not a new battery. Does this sound right? How much does an alternator cost (1984 300 SD) and how many hours labor to install it?
__________________
Jacob Wissler Jr., Houston, Texas, 1984 300 SD
Reply With Quote
  #2  
Old 08-09-2003, 01:12 AM
Registered User
 
Join Date: Mar 2003
Location: Houston, Texas USA
Posts: 59
Details

The car seems to run fine. It has been over 100 degrees for the past few days, so I had the ac on driving around town. Everything was fine until I came out of a store and the battery was dead.
__________________
Jacob Wissler Jr., Houston, Texas, 1984 300 SD
Reply With Quote
  #3  
Old 08-09-2003, 02:01 AM
Registered User
 
Join Date: Jan 2001
Location: oregon
Posts: 2,013
Bosch rebuilt alternator for an SD is about $130.00 plus 75.00 core from Fastlane ,it's a straight foward DIY job,no tricks that I remember.That should disspell any rumors that MB parts are expensive......
William Rogers......
Reply With Quote
  #4  
Old 08-09-2003, 02:37 AM
Registered User
 
Join Date: Mar 2003
Location: Houston, Texas USA
Posts: 59
Install Alternator

How many hours labor?
__________________
Jacob Wissler Jr., Houston, Texas, 1984 300 SD
Reply With Quote
  #5  
Old 08-09-2003, 03:31 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,740
Does the battery light come on when you turn the key to position 2? If so, and it doesn't come on when the engine's running then I don't think the alternator's bad. It might be a bad voltage regulator which is considerably cheaper than a new alternator.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
Reply With Quote
  #6  
Old 08-10-2003, 01:42 AM
vwbuge's Avatar
Registered User
 
Join Date: Sep 2001
Location: Johnstown, Pennsylvania
Posts: 2,101
Alternator is pretty straightforward DIY job. No more than an hour.
__________________
'85 300SD (formerly california emissions)
'02 Jeep Grand Cherokee Limited
'04 VW Passat W8 (6spd manual) SOLD!!
'68/'69 Empi Imp body on '65 Beetle pan
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'72 Triumph T100R
'70 Yamaha R5 Rat Bike
Reply With Quote
  #7  
Old 08-10-2003, 03:37 AM
Registered User
 
Join Date: Mar 2003
Location: Houston, Texas USA
Posts: 59
DIY?

What is DIY?
__________________
Jacob Wissler Jr., Houston, Texas, 1984 300 SD
Reply With Quote
  #8  
Old 08-10-2003, 04:46 AM
Registered User
 
Join Date: Jan 2001
Location: oregon
Posts: 2,013
Dirty,injury,yelling!
William Rogers.........
Reply With Quote
  #9  
Old 08-10-2003, 06:12 AM
BenzMatic's Avatar
You can do it
 
Join Date: Jun 2003
Location: OC S. California
Posts: 120
Do It Yourself.
But William is right about Dirty, Injury, yelling also.
__________________
87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)
Reply With Quote
  #10  
Old 08-10-2003, 07:31 PM
Registered User
 
Join Date: Mar 2003
Location: Houston, Texas USA
Posts: 59
Scam

I had my car checked out by someone else. The alternator and voltage regulator were fine. Only problem was a very old battery. It looks like the first place I went tried to sell me stuff I didn't need.
__________________
Jacob Wissler Jr., Houston, Texas, 1984 300 SD
Reply With Quote
  #11  
Old 08-10-2003, 08:10 PM
Registered User
 
Join Date: Jan 2002
Posts: 18,353
I don't see why they would scam you on an alternator and not on a battery. It could be that the brushes on the alternator are bad and are connecting intermittently. I have never changed them myself but am told it is just a couple of screws and a 15 dollar part.
__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
Reply With Quote
  #12  
Old 08-10-2003, 10:14 PM
Registered User
 
Join Date: Mar 2003
Location: Houston, Texas USA
Posts: 59
Money

They tried to sell me a rebuilt alternator, installed, for $275, and they knew the price (parts and labor) without checking. I think there are cheap alternators for less than $75. That means $200 for changing the part. On a $105 Interstate battery they might make $50.
__________________
Jacob Wissler Jr., Houston, Texas, 1984 300 SD
Reply With Quote
  #13  
Old 08-11-2003, 03:19 AM
Registered User
 
Join Date: Oct 2002
Posts: 188
Jacob:

Although yours is a 126, my 140 just had the job done. If you read from the multi-meter that the current reads below 14.5 with engine running, your alternator is not pushing enough juice to charge the battery. Without the engine running, the battery should read at least 12.75 volts. Mind you, you should have all "normal" electronics turned on to test the alternator juice, i.e. A/C, radio, lights, .........

One more thing, you can change the "small" voltage regulator on the alternator to isolate the problems. Many have responded that the voltage regulator will fix the issue which is a small investment to pay. I have seen the regulators on e-bay.

hope this helps...
Reply With Quote
  #14  
Old 08-11-2003, 03:45 PM
Thomaspin's Avatar
pindelski.com
 
Join Date: Jun 2001
Location: CA
Posts: 531
Alternator regulator replacement instructions can be found here.

If that doesn't do it (cheap) keep the new regulator for use later. FastLane has them.
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 05:08 PM.


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