Alternator - Revision history

Pokseva: /* Replacing alternator */ added info about M113

2025-07-29T15:13:51Z

Replacing alternator: added info about M113

← Older revision		Revision as of 15:13, 29 July 2025
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	# Disconnect negative battery cable. This is important to make sure that when disconnecting alternator battery wire (B+) it does not get shorted to chassis.		# Disconnect negative battery cable. This is important to make sure that when disconnecting alternator battery wire (B+) it does not get shorted to chassis.
	# Remove [[serpentine belt]].		# Remove [[serpentine belt]].
	# Remove oil dipstick to not accidentally ~~breake~~ it off (important on S500).		# Remove oil dipstick to not accidentally break it off (important on [[M113]] engine ([[S430]]/[[S500]])).
	# Removing alternator bolts. The bolts are Torx 16, but 11mm socket will work fine too.		# Removing alternator bolts. The bolts are Torx 16, but 11mm socket will work fine too.
	# Tilt alternator out of bracket. Use pry bar if needed (see below).		# Tilt alternator out of the bracket. Use pry bar if needed (see below).
	# Rotate alternator pulley down (see photo below) and remove wires. Battery wire needs 13mm socket. The other wire pulls of easily.		# Rotate alternator pulley down (see photo below) and remove wires. Battery wire needs 13mm socket. The other wire pulls of easily.
	# Remove alternator from the car. S350 ~~has~~ a lot of space to do that. S500 ~~has~~ less space therefore removal will involve some difficulties~~. Removal of auxillary~~ fan ~~motor will help to get more space~~ (~~it is only 3 10mm bolts~~).		# Remove alternator from the car. On [[M112]] engine cars ([[S350]]) there is a lot of space to do that. On [[M113]] ([[S430]]/[[S500]]) there is less space, therefore removal will involve some difficulties but is possible without removing engine fan (see photo below).
	# Reinstall in opposite order~~. Note that bottom hose bracket is attached with lower bolt~~. It will be easier to push alternator in lower bracket first. To ease installation metal washers can be pushed out of bolt holes.		# Reinstall in opposite order. It will be easier to push the alternator in the lower bracket first. To ease installation, metal washers can be pushed (hammered) out of the bolt holes. Note that the coolant bottom hose bracket is attached with the lower bolt.

	{\|		{\|
	\|[[File:W220_alternator_pry_bar_usage.jpg\|thumb\|none\|Using pry bar to release the alternator from mounting brackets.]]		\|[[File:W220_alternator_pry_bar_usage.jpg\|thumb\|none\|Using pry bar to release the alternator from mounting brackets]]
	\|[[File:W220_alternator_rotated.jpg\|~~300px~~]]		\|[[File:W220_alternator_rotated.jpg\|thumb\|none\|Alternator position to remove connectors]]
	\|[[File:W220_alternator_removed.jpg\|~~300px~~]]		\|[[File:W220_alternator_removed.jpg\|thumb\|none\|Alternator removed ([[M112]] engine)]]
			\|[[File:W220_alternator_removal_angle_M113.jpg\|thumb\|none\|Alternator removal angle (on [[M113]] engine)]]
	\|}		\|}
	<!-- http://www.benzworld.org/forums/w220-s-class/1688209-alternator-voltage-regulator-replace-diy.html -->		<!-- http://www.benzworld.org/forums/w220-s-class/1688209-alternator-voltage-regulator-replace-diy.html -->


	== Electrical connections ==		== Electrical connections ==

Pokseva: link to battery page added

2024-01-11T18:25:52Z

link to battery page added

← Older revision		Revision as of 18:25, 11 January 2024
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	~~Back to '''~~[[~~Index~~]]~~'''~~		See a related page of [[battery]].

	==Specification ==		==Specification ==

Pokseva: /* Checking Alternator Voltage */ photos added

2024-01-11T18:25:12Z

Checking Alternator Voltage: photos added

← Older revision		Revision as of 18:25, 11 January 2024
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	\|}		\|}

	~~Start the vehicle. After few seconds~~ the voltage ~~display~~ will ~~disappear~~. ~~However~~, ~~you can locate it again using [[steering wheel]] buttons~~. ~~The~~ voltage ~~reading~~ with the ~~vehicle running~~ should be ~~displayed~~.		When first opened, the voltage reading will be something like "UB:12.3V". In this example, the 12.3V is the battery voltage with the car at rest with engine off and alternator not charging.
			The voltage should be between 11.8V and 12.5V and will typically be 12.3V with a new battery and the car at rest for about 24 hours or more.

	Correct voltage measurement on alternator should be around 14V (~~the~~ voltage value must not fluctuate - see video of faulty alternator below).		{\|
			\|[[File:01 MFD Hidden Menu UB Engine Off.JPG\|thumb\|none\|Voltage reading before starting engine]]
			\|[[File:06 MFD Hidden Menu UB Engine On.JPG\|thumb\|none\|Voltage reading after starting engine]]
			\|}

			Start the vehicle. After few seconds the voltage display will disappear.
			However, you can locate it again using [[steering wheel]] buttons.
			The voltage reading with the vehicle running should be displayed.

			Correct voltage measurement on alternator should be around 14V (or 14.5 for a voltage regulator set to 14.5 volts).
			The voltage value must not fluctuate (see video of faulty alternator below).

	Sometimes the problem can be in the circuit to the [[battery]]. To test whether the [[battery]] actually receives the voltage generated by alternator, use an accurate Digital Volt Meter (DVM) and monitor the alternator output across the [[battery]] terminals. It should match voltage displayed on the instrument cluster.		Sometimes the problem can be in the circuit to the [[battery]].
			To test whether the [[battery]] actually receives the voltage generated by alternator, use an accurate Digital Volt Meter (DVM) and monitor the alternator output across the [[battery]] terminals.
			It should match voltage displayed on the instrument cluster.

	{\|		{\|
	\|{{#ev:youtube\|https://www.youtube.com/watch?v=FNx5xwkwW3w\|320\|center\|Voltage readings of defective alternator.\|frame}}		\|{{#ev:youtube\|https://www.youtube.com/watch?v=FNx5xwkwW3w\|320\|center\|Voltage readings of a defective alternator\|frame}}
	\|}		\|}
	'''Note:''' This method is not suitable for testing the voltage of [[battery]], since several consumers activated will cause a non-objective measurement. [[Battery]] voltage must be measured without active consumers (i.e. with minimal load) and only across the [[battery]] terminals.		'''Note:''' This method is not suitable for testing the voltage of [[battery]], since several consumers activated will cause a non-objective measurement. [[Battery]] voltage must be measured without active consumers (i.e. with minimal load) and only across the [[battery]] terminals.

			=== Voltage in AC menu ===
	Alternatively, the voltage can be read out from climate control hidden menu. Switch on ignition, press and hold REST button in climate control until hidden menu appears. Go to value NR.24 for voltage reading.		Alternatively, the voltage can be read out from climate control hidden menu. Switch on ignition, press and hold REST button in climate control until hidden menu appears. Go to value NR.24 for voltage reading.

Pokseva: /* Compatible part numbers */ F00M144152

2023-01-05T19:02:19Z

Compatible part numbers: F00M144152

← Older revision		Revision as of 19:02, 5 January 2023
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	* Bosch:		* Bosch:
	** F00M144138		** F00M144138
			** F00M144152
	** F00M145247		** F00M145247
	** F00M145357		** F00M145357

Pokseva: /* Electrical connections */ access underneath the car

2020-11-01T02:29:47Z

Electrical connections: access underneath the car

← Older revision		Revision as of 02:29, 1 November 2020
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	* The thick B+ wire is permanently connected to battery's positive terminal through 150A fuse in the front [[fuses\|prefuse box X4/10]].		* The thick B+ wire is permanently connected to battery's positive terminal through 150A fuse in the front [[fuses\|prefuse box X4/10]].
	* The thin blue wire goes to port 15 of right signal acquisition module (SAM). After ignition is switched on 12 volts are supplied from SAM (on S350 only ~1 volt). A small current starts to flow through the line pre-energizing the alternator's field coil. For the alternator to charge, the blue wire must be connected (at least at the beginning to energize it).		* The thin blue wire goes to port 15 of right signal acquisition module (SAM). After ignition is switched on 12 volts are supplied from SAM (on S350 only ~1 volt). A small current starts to flow through the line pre-energizing the alternator's field coil. For the alternator to charge, the blue wire must be connected (at least at the beginning to energize it).

			If it is problematic to access the connectors through engine bay, the connectors can be attached by accessing alternator from underneath the car.

			[[File:W220_alternator_connections_underneath_car.jpg\|thumb\|none\|Alternator visible from underneath the car]]

	==Replacing alternator voltage regulator==		==Replacing alternator voltage regulator==

Pokseva: /* Specification */ part number for alternator made in Poland

2020-10-10T12:30:07Z

Specification: part number for alternator made in Poland

← Older revision		Revision as of 12:30, 10 October 2020
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	==Specification ==		==Specification ==
	W220 are equipped with two types of alternators. With and without coolant cooling.		W220 are equipped with two types of alternators. With and without coolant cooling.
	* S350, S430, S500: 14V/150A ~~(part~~ no 0986047550)		* S350, S430, S500: 14V/150A
			** Part no 0986047550
			** AS-PL A0194 (new good quality alternator made in Poland - 137 EUR)
	* S55: 14V/180A		* S55: 14V/180A
	* S600: 14V/220A		* S600: 14V/220A

Pokseva: /* Electrical connections */ note about S350 peculiarity

2019-12-15T00:15:52Z

Electrical connections: note about S350 peculiarity

← Older revision		Revision as of 00:15, 15 December 2019
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	Alternator is connected with two electrical wires:		Alternator is connected with two electrical wires:
	* The thick B+ wire is permanently connected to battery's positive terminal through 150A fuse in the front [[fuses\|prefuse box X4/10]].		* The thick B+ wire is permanently connected to battery's positive terminal through 150A fuse in the front [[fuses\|prefuse box X4/10]].
	* The thin blue wire goes to port 15 of right signal acquisition module (SAM). After ignition is switched on 12 volts are supplied from SAM. A small current starts to flow through the line pre-energizing the alternator's field coil. For the alternator to charge, the blue wire must be connected (at least at the beginning to energize it).		* The thin blue wire goes to port 15 of right signal acquisition module (SAM). After ignition is switched on 12 volts are supplied from SAM (on S350 only ~1 volt). A small current starts to flow through the line pre-energizing the alternator's field coil. For the alternator to charge, the blue wire must be connected (at least at the beginning to energize it).

	==Replacing alternator voltage regulator==		==Replacing alternator voltage regulator==

Pokseva: /* Compatible part numbers */

2019-08-24T05:44:36Z

Compatible part numbers

← Older revision		Revision as of 05:44, 24 August 2019
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	* Mobiletron: VRB247		* Mobiletron: VRB247
	* HÜCO: 130608 (14.3v)		* HÜCO: 130608 (14.3v)


	~~''Note: There are voltage regulators that have the same shape, but which will not work if installed.''~~

	{\|		{\|

Pokseva: /* Electrical connections */

2019-08-24T05:43:17Z

Electrical connections

← Older revision		Revision as of 05:43, 24 August 2019
Line 90:		Line 90:
	Alternator is connected with two electrical wires:		Alternator is connected with two electrical wires:
	* The thick B+ wire is permanently connected to battery's positive terminal through 150A fuse in the front [[fuses\|prefuse box X4/10]].		* The thick B+ wire is permanently connected to battery's positive terminal through 150A fuse in the front [[fuses\|prefuse box X4/10]].
	* The thin blue wire goes to port 15 of right signal acquisition module (SAM). After ignition is switched on 12 volts are supplied from SAM. A small current starts to flow through the line pre-energizing the alternator's field coil~~. After alternator starts to produce voltage, alternator gives out 12v through the blue line signalizing SAM that alternator is charging~~. For the alternator to charge, the blue wire must be connected (at least at the beginning to energize it).		* The thin blue wire goes to port 15 of right signal acquisition module (SAM). After ignition is switched on 12 volts are supplied from SAM. A small current starts to flow through the line pre-energizing the alternator's field coil. For the alternator to charge, the blue wire must be connected (at least at the beginning to energize it).

	==Replacing alternator voltage regulator==		==Replacing alternator voltage regulator==

Pokseva: /* Electrical connections */

2019-08-20T20:45:48Z

Electrical connections

← Older revision		Revision as of 20:45, 20 August 2019
Line 90:		Line 90:
	Alternator is connected with two electrical wires:		Alternator is connected with two electrical wires:
	* The thick B+ wire is permanently connected to battery's positive terminal through 150A fuse in the front [[fuses\|prefuse box X4/10]].		* The thick B+ wire is permanently connected to battery's positive terminal through 150A fuse in the front [[fuses\|prefuse box X4/10]].
	* The ~~think~~ blue wire goes to port 15 of right signal acquisition module (SAM). After ignition is switched on 12 volts are supplied from SAM. A small current starts to flow through the line pre-energizing the alternator's field coil. After alternator starts to produce voltage, alternator gives out 12v through the blue line signalizing SAM that alternator is charging. For the alternator to charge, the blue wire must be connected (at least at the beginning to energize it).		* The thin blue wire goes to port 15 of right signal acquisition module (SAM). After ignition is switched on 12 volts are supplied from SAM. A small current starts to flow through the line pre-energizing the alternator's field coil. After alternator starts to produce voltage, alternator gives out 12v through the blue line signalizing SAM that alternator is charging. For the alternator to charge, the blue wire must be connected (at least at the beginning to energize it).

	==Replacing alternator voltage regulator==		==Replacing alternator voltage regulator==