Advance Auto Zone

MERCEDES BENZ ALTERNATORS

Alternators & Regulators Bosch with internal regulators
DESCRIPTION
Alternators made by Bosch are conventional 3-phase, self-rectifying type alternators.

Bosch 75 through 55-amp alternators use3 negative 3 positive and diodes connected to stator windings to rectify current, Bosch 90 and 80-amp alternators use 14 diodes.

All alternators use 3 exciter diodes connected to stator windings, while the engine is running these diodes turn off the alternator indicator light and supply power to the voltage regulator, Bosch regulators are transistorized solid state and integral with alternator.

ALTERNATOR APPLICATION
Model Volts/Amps

(1) Manufacturer’s Part No.

190E 14/70 489 928
190D 14/70 489 897

All Others 14/70 N/A
(1) Bosch alternator part numbers are preceded by the numbers 0 120 or beginning with an AL lettering a number and ending with an X.

1. You can connect a voltmeter to the alternator “B ” terminal and ground, voltmeter should indicate battery voltage, if not check wiring between battery and alternator.

2. Turn ignition on and check that alternator indicator light comes on, if light does not come on, check wiring between warning light and alternator, including indicator bulb.

1. Ensure connections at battery, alternator, and starter are clean and tight, ensure alternator engine and body are properly grounded, ensure alternator belt is tight and in good condition.

2. Connect ammeter following manufacturer’s instructions, connect voltmeter leads to battery terminals.

3. Start engine and run at 3000 R.P.M. adjust carbon pile to obtain maximum alternator output, do not allow voltage to go below 12.6 volts.

4. Alternator output should equal alternator rated output, minus 16-20 amps, if reading is 16-20 amps below alternator rating, replace regulator and retest, if output is still too low, repair or replace the alternator.

REGULATOR CONTROL VOLTAGE TEST

1. Connect ammeter following manufacturer’s instructions, connect voltmeter leads to battery terminals, run engine at 3000 R.P.M.

2. Run engine until voltage stops rising, voltage should be 13.5-14.5 volts, if reading is incorrect, remove regulator and ensure brushes are longer than 6 m.m..

3. If brushes are okay and regulator fails to keep voltage within specified limits, replace regulator and retest, if voltage is still incorrect, repair or replace alternator.

OVERHAUL
DISASSEMBLY

1. Remove nut, lock washer, and pulley, remember position of spacers, Then remove fan assembly and key, scribe mark on front and rear housings, remove voltage regulator and remove screws, separate front and rear housings.

2. Disconnect capacitor from terminal; remove nut, insulators, screws and washers.

Remove stator assembly.
3. Unsolder stator from diode assembly; remove bearing wave washer or o ring from rear of housing.

3. Support front housing and carefully press out rotor, do not allow rotor to fall, remove screws securing bearing retainer, remove retainer front bearing and seal remove rear bearing from slip ring at end of rotor.

TESTING & REPAIR
Diode Assembly
1. Place ohmmeter scale on x100 scale connect ohmmeter leads across “B ” terminal and 3 stator terminals one at a time, reverse leads, ohmmeter should indicate continuity in one direction only.

2. Reconnect ohmmeter leads across negative and 3 stator terminals one at a time.

Reverse leads; ohmmeter should indicate continuity in one direction only.

3. Connect ohmmeter leads across “D ” terminal and 3 stator terminals one at a time.

Reverse leads, ohmmeter should indicate continuity in one direction only, if diodes are found to be defective, replace the diode assembly.

Fig. 3: Diode Assembly Test Diode assembly for 55 amp alternator is shown, others are similar.

1. Place ohmmeter on lowest scale, connect ohmmeter across stator leads, resistance between leads should be 14 15 ohms for 55-amp alternator and .09 10 ohms for 65 through 90 amp alternators, if resistance is incorrect, stator has open or shorted windings and must be replaced.

2. Place ohmmeter on X 1000 scale. Connect ohmmeter between stator core and stator lead, no continuity should exist, if continuity exists, stator is grounded and must be replaced.

1. Place ohmmeter on lowest scale, connect ohmmeter across slip rings, resistance should be 3 4-3.75 ohms for 55 amp alternator and 2.8 3.1 ohms for 65 through 90 amp alternators.

2. If resistance is too low, rotor has short circuit and it must be replaced if resistance is infinity no continuity, rotor has open circuit and must be replaced.
3. Place ohmmeter on x1000 scale, reconnect ohmmeter between either the slip ring and rotor core, no continuity should exist, if continuity exists, rotor is grounded and must be replaced.

4. Clean slip rings using a very fine sandpaper, rings which are worn or pitted should be turned on lathe, minimum ring diameter is 1 1/16″ 26.8 m.m. if slip rings are beyond repair, replace slip rings as outlined in steps 5 and 6.
5. Remove rear bearing from slip ring end of rotor, unsolder wires from slip rings and bend up ends of rotor winding, pull off slip rings, ensure ends of rotor winding are not damaged.

6. Insert the ends of rotor winding into slip ring and press new slip ring onto rotor, slip ring end must be 9/64″ 3.5 m.m. from end of the collar, solder rotor winding to slip ring terminals, turn rings on lathe and retest rotor, maximum slip ring run out is 0012″.03 m.m..

The Bearings
Always replace bearings, if replacement front bearing is sealed on one side only, open side must face rotor, if replacement rear bearing is sealed on one side only, open side must face away from rotor.

Brushes
Ensure brushes are longer than 6 m.m. replace if necessary, unsolder brushes from voltage regulator, solder new brushes, and do not allow solder to run into strands of brush leads.

Brush must be free to slide in holder with normal spring tension of 10-14.

REASSEMBLY
1. Install the bearing, retainer, and screws in front housing, press rotor onto housing.

Press bearing on slip ring end of the rotor, solder stator to diode assembly, exercise care when soldering near diodes due to possible heat damage.

2. Install insulators on stator assembly, assemble stator assembly and rear housing, install wave washer or O ring in rear housing, align the scribe marks and assemble front and rear housings.

3. Install key, fan assembly, and spacers, install the pulley, lock washer and nut, tighten nut to 23-29 ft. 3-4 Nm. Ensure rotor spins freely, and install voltage regulator and capacitor.

Clint Hough is an author and web site publisher on imported car parts and you can get all your importedcarparts.com Mercedes Benz Parts from our on line catalog for all your Mercedes Car Parts needs at importedcarparts.com Imported car parts.com.

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Designed to fuse and to connect the car and the driver, the Acura EL boasts a truly unique driving and riding experience. This car is known as a spirited automobile for it holds power and precision that connects the driver with the road. Even if this is so, the Acura EL also has a unique styling that exudes elegance and sophistication. Most people who have been able to handle and take a closer look at the Acura EL exclaim that it is very much like a Honda Civic although only the brand has been changed. The vehicle is then economical, provides an excellent and smooth performance, as well gives easy comfort.

The Acura EL has a redesigned grille and headlights. It also contains clean lines from the rear deck that provides the Acura EL a distinct European look. Made available in two trim levels which comprise of the elegant touring level and the lavish Premium, this car will surprise riders and drivers with its beauty, refinement, and dynamic performance. The car also boats an impressive linear steering as well as a precise four-wheel drive that has independent suspension. Drivers and passengers of the Acura EL will be given a superior road feel as well as a unique and different control.

Powering this vehicle is a very responsive 1.7 liter VTEC engine that is very much capable of producing 127 horsepower. Along with it is a five speed manual transmission, or the optional four speed automatic transmission. The car idles silently, has the ability to accelerate smoothly, can run with efficiency, and it also responds to inputs immediately. It remains quiet and serene during driving yet it boasts a boundless type of energy that is ready to shoot the car off the streets. For convenience, the Acura EL also has the Logic Control System installed.

The cabin exudes sophistication. Other safety features made standard include dual stage front airbags, side airbags, anti-lock brakes (ABS), and child safety locks. As per standard features, the Acura EL boasts an automatic climate control, a steering wheel wrapped in leather, a cruise control, power windows, power door locks, body colored fastbodyparts.com/parts/acura/mirror/ mirrors, body colored handles, a remote keyless entry, tinted glass, heated front seats, and a power sunroof. The control panel for this car is easy to understand. It sports big buttons that would allow the driver and passengers to quickly set the temperature, radio, or turn on or off the air conditioning and the rear defroster.

The Acura EL has been compared to other vehicles in its range. The list of competitors include the 2005 Chevrolet Cavalier, the 2005 Dodge SX, the Ford Focus, the Honda Civic, the Hyundai Elantra, the Kia Spectra, the Mazda Mazda 3, and the Nissan Altima.

Acura EL owners and enthusiasts could shop for discount car parts and accessories from fastbodyparts.com/ Auto Parts Fast’s online performance or replacement auto parts catalog. In stock are thousands of Acura EL parts and fastbodyparts.com/parts/acura Acura parts.

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As a former news correspondent for an auto-related website, Stacey has gathered extensive knowledge and experience in the automotive industry. This 34 year old mother of two from Memphis is a genuine car lover.

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Driving on the road is as unsafe today as it was years ago. Why? Because of a device mounted on your vehicle. This device is your side view mirror. Standard side view mirrors were installed on cars for years because they supposedly had the function of protecting you from getting into accidents, by allowing you to see on the side and back of your vehicle.

But did this work? Well think about this. You are driving down the highway and you happen to be in the middle lane or outer lane and you want to move over. You may or may not put your turn signal on, but you took the time to look back, trying to be careful so you don’t hit anyone, then you start edging your car over, only to hear the loud blast of the driver’s horn as he approaches you from the rear. You take evasive action by moving back into your previous lane in order to avoid a possible accident. Does this sound like the mirror worked. Don’t sound like it. As a matter of fact, accidents are happening and have always happened due to blind spots from side view mirrors.

Sam Stephens of the Automobile Safety Foundation stated that “Drivers can not merge onto a freeway, or change lanes safely with standard equipment mirrors as they have a lethal blind spot.” Doesn’t sound promising. Also, the National Highway Transportation Safety Administration and the U.S. Department of Transportation stated that more than 413,000 vehicle accidents were caused by blind spots.

It is apparent that the most accidents occur when vehicles are changing lanes than any other form of collision. On average, more than 826,000 vehicles and more than 160,000 people are injured due to blind spots. It is obvious that the standard side view mirrors mounted on cars do not work. The blind spot mirror attachments are unsafe to use and need to be replaced.

The ASF realizes this danger and as such did quite a bit of extensive research into the area of side view mirrors and found what they believe would be the optimate solution to the problem. This would be aftermarket blindspot mirrors that have a special mirror attached that allows drivers to see beyond the back of the car. Hopefully these mirrors could become standard equipment on future built vehicles.

Harry Husted is a freelance writer and author. His specializes in ghostwriting, copywriting, and web site content. He has written well over 1000 SEO-related articles and is also an author of two books, Learn How to Repair Computers: Get Certified in 15 Weeks and How to Find and Start a Legitimate Home Business. He is also co-author of Byron Unleashed. Harry can be reached by sending email to mailto:husted@creatingwords.com husted@creatingwords.com or visit his site at creatingwords.com. creatingwords.com.

This article is copyright (c) 2006 by Harry Husted, and may be reprinted in it’s entirety as long as this byline and copyright statement is included.

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