I need to replace the alternator on my Mercedes Benz 190e 2.3 engine. Suppliers offer re-manufactured alternators from 55 to 70 amps and as the amperage goes up so does the price. If the 55 amp alternator works on my car why would I want to buy the more expensive 70 amp unit?

Go to the following link and the first photo shows the belt routing. I hope this helps as I know changing the belts on these vehicles can be a major pain in the neck.
Pelican Mercedes Benz Tech Article Mercedes Benz Drive Belt Replacement...

OVP will not cause it to stall once engine is running. Check the distributor cap and rotor as they often burn out. Coil can fail too.

it is on the right side of the engine. It is hidden under the engine ecover and cold air ducting on that side. To get it off is two bolts and one connector. You will need to take the serpintine belt off as well. I don't have a image for that right now but either find one thata shows where the belt goes or make a drawings before you take it off. That way replacing the alternator is not a headache and should take less than an hour.

Try or (have your mechanic) remove oil pressure switch and clean. They gum up and it's a safety feature that when car is in accident and/or roll over, when oil pressure drops (eng quits) power to fuel pump shuts off. Sticking oil pressure switch is common on Benz Diesels

The alternator is held by 2 long bolts: one on top and one at the bottom. Identify the location of these bolts. Lose the top bolt first, remove completely the bottom bolt. Use the top bolt as a pivot point to lift the alternator so the belt can be out of the pulley grove. After that take off the top bolt so the alternator can come off easily. Put in the new one in reverse from what you did. Good luck.

If it wont turn over try the neutral safety switch, if it wont start in neutral either the switch most likely needs to be replaced.

Serpentine Belt Diagram - 87 Merc 190E

Go to the following web site below (copy and paste the web address below into your browser)

http://www.daycoproducts.com/daycoweb.nsf/cf652a4feb630ad0862571a4005ae40c/a866a821123f887c862571a5006988df!OpenDocument

There are 2 PDF documents to open - above the photo on the site.

The first - the Routing Guide - shows the reference for the belt diagram (1987 MERC 190E) which is 6-2 on page 92 of the Guide.
The second PDF shows the belt diagram for 6-2.

Hope this helps.
Cheers
Sean
Voluntary contributor.

AF3 DEXRON®-III Automatic Transmission Fluid
BMW: Power steering use AF3; Models with combined power steering,
hydraulic brake booster, self-leveling suspension system use SLF
Mercedes-Benz: Use only manufacturer approved fluid


Look on the back of the bottle of fluid you are looking to buy, if it does not say is is approved by MB, don't use it.

Check your Klima relay ,located behind the battery next to the ABS and Engine ECU ,sounds like the a/c compressor is not turning on