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 06-02-2003, 09:09 AM
Michael's Avatar
Veteran
 
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
'88 300TE: Bad alternator? Upgrade?

Wanted to get some opinions from the Forum. Upon starting the TE yesterday, all of the warning lights on the dash came on, dimly. Having had a bad alternator before, I immediately checked the voltage at the battery and found 11.2 volts. I shut the car off and tested it at the battery again, which registered 12.3 volts. Clearly the alternator's not doing much, if anything. I then pulled the plug off of the alternator, and found it to be a bit corroded. I gave it a quick cleaning, coated it in electrically-conductive grease, then re-inserted it. Fired the car up, and I saw 13+ volts at the battery.

However, when I turned on a few accessories (A/C, lights) the voltage dropped (again, measured at the battery) to about 12 volts, at idle. Shouldn't the alternator still be putting out some power at this point? Plus, I think I hear some noise coming from the alternator, and a new smell is coming up from under he hood.

FWIW the current alternator is 4 yrs/50k miles old, and is a Bosch reman. Presuming it's giving me a warning before it dies outright, I think I'm going to replace it. I'd like recomendations as to a higher-output unit (not the huge 143 amp unit though) that'll bolt right up - perhaps from a ;94-'95 E320? Any ideas?

Thanks in advance, guys
__________________
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

Michael
1995 E500 street car
1986 Porsche 944 Turbo S track car
Reply With Quote
  #2  
Old 06-02-2003, 09:16 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The 1990 & later 300E's use a 80A alternator(AL66X bosch) that is a direct fit requiring only a small wiring harness. This is an up-grade that will make a big difference in the summer OR if you have an aftermarket stereo.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #3  
Old 06-02-2003, 11:36 AM
Michael's Avatar
Veteran
 
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
Thanks Doc!

I followed up my earlier post with a call to my local MBZ retailer. Turns out that there's an even bigger alternator (90 amp) that's supposed to be a bolt-on: MBZ P/N 009 154 02 02. Should also require the same wiring modification, specifically soldering the early-design 2 smaller (+) wires together to mate to a single ring terminal. Otherwise the bigger alternator seemed to have all the same design parameters as the 80 amp. We'll see when it gets here tomorrow.

FWIW there's also an even bigger alternator, 110 amp, that should bolt up (it's specified for a '95 E320) but it does also specify a different V belt be utilized. Since the M103 and M104 engines used different V-belts, and there was only a P/N for the alternate belt on the M104 application, I decided to settle for the 90 amp.

Now, can anyone give me advice on how to remove the V-belt? The bolt that holds the tensioner in place looks pretty tough to get to - any tricks?

I'll advise as to how the install goes.
__________________
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

Michael
1995 E500 street car
1986 Porsche 944 Turbo S track car

Last edited by Michael; 06-02-2003 at 11:53 AM.
Reply With Quote
  #4  
Old 06-02-2003, 11:45 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Whichever alt you use the best way to wire it is to use the later harness 124 543 45 26. The difference between the early alt and the later in the hook-up is the output terminals screw on the hi outout alternators.

Unless you can aquire 8mm ID eye terminals of proper stature and solder them in you will be using up connectors with the high output.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #5  
Old 06-02-2003, 12:30 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,739
Re: Thanks Doc!

Quote:
Originally posted by Michael
Now, can anyone give me advice on how to remove the V-belt? The bolt that holds the tensioner in place looks pretty tough to get to - any tricks?
Somewhat covered in...

86 300E indicator lights on - alternator prob?

I"m not sure how the hydraulic pump in a TE complicates things.

BTW, it's not a V-belt if it has multiple grooves.

Sixto
91 300SE
87 300SDL
83 300SD
Reply With Quote
  #6  
Old 06-02-2003, 02:50 PM
Michael's Avatar
Veteran
 
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
It's tough to get to, but not impossible.

Now, near as I can tell it's not 17mm; likely is a 19-need to go pick up a deep 19mm to get in there.

Thanks again!
__________________
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

Michael
1995 E500 street car
1986 Porsche 944 Turbo S track car
Reply With Quote
  #7  
Old 06-03-2003, 06:42 PM
Michael's Avatar
Veteran
 
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
It was 19mm-easier to get to from under the car.

Installation was pretty straightforward, other than having to swap the pulley over from the old unit to the new one (which uses an internal fan, rather than the external separate deal on the old unit)-needed air tools for that.

I soldered high grade ring terminals on the end of the old harness wires-looks great, now we'll see if it holds up (Thanks Steve).
.
__________________
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

Michael
1995 E500 street car
1986 Porsche 944 Turbo S track car
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 10:57 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