2001 Disco II Alternator Issue
Thread Starter
|
Three Wheeling
Joined: Jul 2011
Posts: 65
Likes: 1
2001 Disco II Alternator Issue
I checked my battery and alternator today and it doesn't look like the alternator is charging the system. I checked the large wire and it has continuous battery voltage going to it (12.3V) and the smaller wire has less than one volt. I was looking in the RAVE diagrams and it shows a light in the cluster. Is this system like the old chevy systems and when the light buld in the dash burns out the alternator doesn't charge anymore?
thankyou
-Will
thankyou
-Will
TReK
Joined: Dec 2009
Posts: 2,243
Likes: 10
From: Albany, NY
does it put out 14.2 volts at idle? when you put the lights and the ac on and the radio on does it drop down to battery voltage? if it does either its the alternator. if its at 14.2 or above then you have something else like a battery issue.
Super Moderator
Joined: Jan 2011
Posts: 16,322
Likes: 88
From: Savannah Georgia
From the RAVE (file ellt033e.pdf) :
Charging Operation
With the ignition switch in position II, the feed from fuse 27 is connected from the passenger
compartment fusebox on an LG wire, through header C0760, to the ignition/no charge
warning lamp in the instrument pack. From the instrument pack, the feed is connected on an
NY wire to the alternator/ generator. The feed passes to earth via the brushes and regulator
within the alternator, completing the warning lamp circuit which allows the warning lamp to
illuminate.
When the engine is started, the magnetized rotor turns within the stator windings, generating
3 phase alternating current (ac) and a voltage that rises rapidly with rotor speed. The field
diode in the rectifier pack converts the ac current into dc current flowing through the field
windings. This causes an increase in the magnetic influence of the rotor, resulting in selfexcitation
of the alternator. The field current increases with rotor speed and thus increases
the generated current and voltage until the alternator/generator is fully excited.
When the voltage applied to the alternator/generator side of the ignition/no charge warning
lamp exceeds the battery voltage applied to the warning lamp, the lamp is extinguished. This
shows that the alternator/generator is producing battery charging current.
When the battery is at a low state of charge or the current draw from the electrical functions
of the vehicle causes a voltage drop, the alternator/ generator automatically charges at its
maximum rate (dependant on rotor speed) until 14 volts is reached. When demand on the
alternator/generator falls, the current output is reduced.
Battery charging is accomplished on an N wire from the alternator/generator through fusible
link 1 in the engine compartment fusebox, and from fusible link 1 to the battery positive
terminal on an R wire.compartment fusebox on an LG wire, through header C0760, to the ignition/no charge
warning lamp in the instrument pack. From the instrument pack, the feed is connected on an
NY wire to the alternator/ generator. The feed passes to earth via the brushes and regulator
within the alternator, completing the warning lamp circuit which allows the warning lamp to
illuminate.
When the engine is started, the magnetized rotor turns within the stator windings, generating
3 phase alternating current (ac) and a voltage that rises rapidly with rotor speed. The field
diode in the rectifier pack converts the ac current into dc current flowing through the field
windings. This causes an increase in the magnetic influence of the rotor, resulting in selfexcitation
of the alternator. The field current increases with rotor speed and thus increases
the generated current and voltage until the alternator/generator is fully excited.
When the voltage applied to the alternator/generator side of the ignition/no charge warning
lamp exceeds the battery voltage applied to the warning lamp, the lamp is extinguished. This
shows that the alternator/generator is producing battery charging current.
When the battery is at a low state of charge or the current draw from the electrical functions
of the vehicle causes a voltage drop, the alternator/ generator automatically charges at its
maximum rate (dependant on rotor speed) until 14 volts is reached. When demand on the
alternator/generator falls, the current output is reduced.
Battery charging is accomplished on an N wire from the alternator/generator through fusible
link 1 in the engine compartment fusebox, and from fusible link 1 to the battery positive
Administrator
Joined: Apr 2006
Posts: 25,707
Likes: 107
From: Denver, Colorado
Go to a local parts store and have them test the charging system for free. Voltage should be between 13.6 and 14.4 volts. If the battery is in question have them run a load test to verify it's capability.
If you need an alternator, go to British Parts of Utah for one of the better prices, do not buy a rebuilt from a parts store, they have a very high failure rate.
If you need an alternator, go to British Parts of Utah for one of the better prices, do not buy a rebuilt from a parts store, they have a very high failure rate.
Thread
Thread Starter
Forum
Replies
Last Post
wyrdvans
Retired - Private 'Wanted' Classifieds
5
Apr 20, 2012 04:06 AM
JumPeR04
Retired - Private For Sale/Trade Classifieds
0
Dec 17, 2009 07:57 PM
mgabriel
General Range Rover Discussion - Archived
1
Dec 11, 2008 11:53 PM
