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Alternator for car

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Replacement of Alternator: Video repair guide
How to change alternator on MERCEDES-BENZ 190 W201 TUTORIAL | AUTODOC

How to change alternator on MERCEDES-BENZ 190 W201 TUTORIAL | AUTODOC Top brands that produce alternator: BOSCH, STARK, SACHS, SKF, VAN WEZEL,...

Step by Step Video Tutorial for Do-it-yourself Auto Repair. Become an amateur mechanic with Autodoc.

Generator for Top car maker
Alternator in brand quality: Top manufacturers
  • Original RIDEX Alternator
  • Original DENSO Alternator
  • Original CV PSH Alternator
  • Original AS-PL Alternator
  • Original ROTOVIS Automotive Electrics Alternator
  • Original VALEO Alternator
  • ALANKO
  • STARK
  • LUCAS ELECTRICAL
  • EUROTEC
  • MESSMER
  • HELLA
  • BOSCH
  • CASCO
  • MAGNETI MARELLI
  • JP GROUP
  • DRI
  • ELSTOCK
  • MAPCO
  • Henkel Parts
  • ERA
  • LUCAS
  • DELCO REMY
  • VEMO
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Best-selling products:
The best-selling replacement parts from the Alternator section. We have a large selection of spare parts from different brands for Alternator and further low-price offers in our range of parts
-25%
Buy Generator RIDEX 4G0073
Alternator
Article number: 4G0073
£ 74,26
incl. 20% VAT, excl. delivery costs,
  • Alternator Charge Current [A]: 90
  • Voltage [V]: 12
  • Number of grooves: 6
  • Length 3 [mm]: 61
  • Number of mounting bores: 4
  • Length [mm]: 39,5, 14
  • RIDEXAlternator
  • Item number4G0073
  • Manufacturer's suggested retail price £ 99,01
  • Our price £ 74,26
  • Condition  New
Details
-25%
Buy Alternator RIDEX 4G0004 Number of ribs: 6
Alternator
Article number: 4G0004
£ 106,31
incl. 20% VAT, excl. delivery costs,
  • Alternator Charge Current [A]: 140
  • Voltage [V]: 12
  • Belt Pulley Ø [mm]: 56,2
  • Pulleys: with freewheel belt pulley
  • Number of ribs: 6
  • Length 3 [mm]: 61,5
  • Length [mm]: 42, 14
  • RIDEXAlternator
  • Item number4G0004
  • Manufacturer's suggested retail price £ 141,75
  • Our price £ 106,31
  • Condition  New
Details
-25%
Buy Generator RIDEX 4G0037 Number of ribs: 7
Alternator
Article number: 4G0037
£ 105,35
incl. 20% VAT, excl. delivery costs,
  • Alternator Charge Current [A]: 100
  • Voltage [V]: 14
  • Belt Pulley Ø [mm]: 58
  • Pulleys: with freewheel belt pulley
  • Number of ribs: 7
  • Plug Type ID: L-IG-RLO-M Plug 203
  • Vehicle Main Current: for vehicles with 12V main current
  • Bore Ø 1 [mm]: 8
  • Thickness 1 [mm]: 60
  • Length 3 [mm]: 71
  • Bore Ø 2 [mm]: 10
  • Length [mm]: 57
  • Net weight [kg]: 5,9
  • RIDEXAlternator
  • Item number4G0037
  • Manufacturer's suggested retail price £ 140,47
  • Our price £ 105,35
  • Condition  New
Details
-25%
Buy Alternator RIDEX 4G0127 Number of ribs: 6
Alternator
Article number: 4G0127
£ 122,10
incl. 20% VAT, excl. delivery costs,
  • Alternator Charge Current [A]: 150
  • Voltage [V]: 14
  • Belt Pulley Ø [mm]: 59
  • Pulleys: with freewheel belt pulley
  • Number of ribs: 6
  • Plug Type ID: L-DFM Plug 121
  • Vehicle Main Current: for vehicles with 12V main current
  • Clamp: B+ M8
  • Bore Ø 1 [mm]: 10,5
  • Thickness 1 [mm]: 92,5
  • Length 3 [mm]: 74
  • Length [mm]: 48, 42
  • Net weight [kg]: 7,2
  • RIDEXAlternator
  • Item number4G0127
  • Manufacturer's suggested retail price £ 162,80
  • Our price £ 122,10
  • Condition  New
Details
-25%
Buy Generator RIDEX 4G0119
Alternator
Article number: 4G0119
£ 117,81
incl. 20% VAT, excl. delivery costs,
  • Alternator Charge Current [A]: 130
  • Voltage [V]: 14
  • Pulleys: with freewheel belt pulley
  • Number of grooves: 7
  • Plug Type ID: PL146
  • Diameter [mm]: 58
  • RIDEXAlternator
  • Item number4G0119
  • Manufacturer's suggested retail price £ 157,08
  • Our price £ 117,81
  • Condition  New
Details
-25%
Buy Alternator BOSCH 0 986 038 950
Alternator
Article number: 0 986 038 950
£ 215,71
incl. 20% VAT, free delivery
  • Alternator Charge Current [A]: 120
  • Voltage [V]: 14
  • Belt Pulley Ø [mm]: 50
  • Pulleys: with multi-belt pulley
  • Number of grooves: 6
  • Service exchange part
  • Rotation Direction: Clockwise rotation
  • Alternator type: excl. vacuum pump
  • Fastening Type: Double Pivot Lever
  • Recommended additional repairs: V-Belt/V-Ribbed Belt
  • Clamp: B+(M8),D+(M5),W
  • Length [mm]: 179
  • Distance from pulley to alternator [mm]: 40
  • BOSCHAlternator
  • Item number0 986 038 950
  • Manufacturer's suggested retail price £ 287,61
  • Our price £ 215,71
  • Condition  Remanufactured
Details
-25%
Buy Generator DENSO DAN930 Number of ribs: 6
Alternator
Article number: DAN930
£ 131,40
incl. 20% VAT, excl. delivery costs,
  • Alternator Charge Current [A]: 150
  • Voltage [V]: 14
  • Belt Pulley Ø [mm]: 54
  • Pulleys: with freewheel belt pulley
  • Number of ribs: 6
  • Vehicle Main Current: for vehicles with 12V main current
  • New Part
  • Quality: OE
  • DENSOAlternator
  • Item numberDAN930
  • Manufacturer's suggested retail price £ 175,20
  • Our price £ 131,40
  • Condition  New
Details
-25%
Buy Alternator LUCAS ELECTRICAL LRA02226 Number of ribs: 6
Alternator
Article number: LRA02226
£ 154,91
incl. 20% VAT, free delivery
  • Alternator Charge Current [A]: 150
  • Voltage [V]: 14
  • Belt Pulley Ø [mm]: 54
  • Pulleys: with freewheel belt pulley
  • Number of ribs: 6
  • Plug Type ID: L-DFM (PLUG 129)
  • Vehicle Main Current: for vehicles with 12V main current
  • Clamp: M8 B+
  • Bore Ø 1 [mm]: 10
  • Thickness 1 [mm]: 21
  • Length 3 [mm]: 45
  • Length [mm]: 42
  • Net weight [kg]: 6,7
  • LUCAS ELECTRICALAlternator
  • Item numberLRA02226
  • Manufacturer's suggested retail price £ 206,54
  • Our price £ 154,91
  • Condition  Remanufactured
Details
Alternator: choose from 75556 options on AUTODOC

Alternator from 71 manufacturers at prices from 27,11£ to 4768,03£

The bestselling products:
66021507 DAN521 DRA0182 DRA3655 439845 LRA02910
From popular manufacturers:
RIDEX DENSO CV PSH AS-PL ROTOVIS Automotive Electrics VALEO
For popular car brands:
BMW VW MERCEDES-BENZ FORD AUDI VAUXHALL
Alternator – technical details:
Alternator Charge Current [A]: Belt Pulley Ø [mm]: Pulleys:
55 75 58 60 Pulley without belt pulley
100 95 60,5 53,3 with multi-belt pulley with freewheel belt pulley
180 70 59 56 with v-ribbed belt pulley with belt pulley

Learn more about Alternator - operation method, diagnosis, causes of faults and replacement intervals.

A car’s alternator is a device that transforms the mechanical power of crankshaft rotation into electric current. The energy it produces is used to charge the battery and power various electrical devices while the engine is running. In some cars, this unit is also used to start the engine.

Types

  • With carbon brushes. These are the most common alternators. In such devices, the exciter winding is mounted on the rotor shaft. The excitation current flows to the rotor through carbon brushes.
  • Brushless. These are less common. They are reliable and durable. These alternators have the exciter winding mounted directly on a stator. Electromotive force is formed due to changes in magnetic conductivity of the air gap between the rotor and the stator.

Moreover, the devices differ in size, relative positions of some of their elements, power, and performance.

Apart from conventional alternators, there are combined starter motor/alternator assemblies. Typically, they are installed on hybrid vehicles or cars equipped with the “Start-Stop” system.

Operating tips

After performing any repair job or inspection of the unit, always make sure the wires were connected correctly. Reversing the polarity of connection may lead to the breakdown of rectifier diodes and voltage regulator. Remember, if you disconnect the alternator from the battery while the engine is running, this may damage the vehicle’s electrical system. Never try to check if the unit is operable with the help of a spark by connecting the unit’s positive terminal to the car body. Do not jump-start another car while the engine in your car is running.

Keep your engine bay clean. Soiling is dangerous both for the unit housing, as this can lead to its corrosion, and for electrical contacts because they might oxidise. But remember to protect the alternator from splashes when washing the engine, for example, by covering it with a durable plastic bag.

Inspect the drive mechanism regularly. An overtightened belt or improperly installed rollers can cause the pulley bearing to fail prematurely. Remember, the pulley is also a consumable. The car manufacturers specify its service life in the owner’s manual. Replace the pulley when it ends.

Avoid driving through deep puddles. If there is no other way, try to cross them carefully at low speed. Temperature variations can damage the unit.

Symptoms of malfunctions

Diode bridge faults, voltage regulator malfunctions, torn or loose drive belt almost always lead to the undercharging of the battery. Therefore, if your battery warning light is constantly blinking during driving, you will usually need to check your alternator. If your headlights are dim and the horn sounds rattling while the engine is running, this may also indicate malfunctions of the unit. You may notice specific humming from under the bonnet in case the bearing is worn out. Whistling noise usually indicates that the belt is torn or has oil on it.

Causes of malfunctions

Water or a mixture of oil and dirt getting onto the circuit board of the diode bridge, as well as reversing the connection polarity, can cause the bridge to burn out. Reversed polarity is also dangerous for other alternator parts, including the voltage regulator, which can also fail after a short circuit in the vehicle mains. Incorrectly mounted idlers and tensioners, as well as errors in belt installation, can lead to the pulley breakdown. Brushes fail because of normal wear and tear.

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faq
How to make an alternator to serve as long as possible?

Follow these simple recommendations in order to avoid premature breakdown of this component:

  • Try to avoid deep puddles or reduce speed before driving through them. Moisture coming to the component can cause its breakdown.
  • When cleaning the space under the bonnet, protect the alternator and other electrical components from water with a polyethene film.
  • Clean the unit with compressed air during every scheduled engine maintenance.
  • Check and adjust tensioning of the V-ribbed belt regularly.
  • Use a torque wrench for tightening fasteners.
  • Avoid installation of additional equipment to protect the car’s electrical system from overloading.
How to detect an alternator malfunction?

The first step of checking the unit is to assess its condition visually. Its casing should have no cracks and dents, and its belt should not have critical abrasions and damaged parts. There should be no bent wires and sparks in places of their connection to the terminals.

The next step is to measure the voltage on the battery terminals, for which you’ll need a multimeter. It should be 12,5–12,7 V with the engine off, and 13,8–14,5 V with the running engine and all electrical components turned off. Under the load, with the air-conditioning system, headlights, the heater, and window heating turned on, it should be no less than 13,7–14,0 V.

If any malfunctioning takes place, remove and disassemble the component. You can estimate the wear degree of the brushes by checking their height, and of the contact rings by assessing their diameter. Measure the resistance of the rotor and stator winding and the diode bridge to define whether there is an open circuit. Compare the received data with those specified in the vehicle’s technical documentation.

How to repair or change an alternator yourself?

The procedure can differ for cars of various makes and models. It mostly depends on the arrangement of the components under the hood. For instance, on some cars, the unit can be accessed after opening the hood, while on others – from under a lifted car. Usually, the replacement requires the following steps

  1. Disconnect the negative terminal from the battery.
  2. Remove the components blocking access to the alternator.
  3. Remove the drive belt.
  4. Take a photo of or mark the wires to avoid mistakes during reassembling. Disconnect them.
  5. Unscrew all fasteners and remove the unit.
  6. Install a new part.
  7. Inspect the belt and pulleys visually. Replace them if necessary.
  8. Connect all contacts and install the removed components back to their places

The alternator repair consists of replacing the contact rings and brushes, bearings, freewheel clutch and diode bridge. If you have experience in such repairs, you can do this yourself. Otherwise, seek assistance from a car workshop electrician.