Guide to show what could be wrong with your Charging System

I had this from a friend sometime a go.

I find a lot of Pajero owners still puzzled with his Pajero electronics strange behaviour.....Pajero electronics especially the MK1's one are pretty tough and any electrical faults usually caused by the Alternator,Pajero wiring system is not same as many Japanese or any continent car so it not strange when a lot of people even electrician itself also don't know what was wrong with it......

So I'm going to explain what wrong could happen to your Pajero electrical system and what action should be taken to correct it at here.....
______________________________________________________________________________________________________
I believe a lot of people knows that when a tiny light with Battery logo on it lit up,it show that the Alternator or the Battery on the car is gone.....but this is not same with our lovely Japan made Pajero,when there is any trouble with the charging system,it will show up 3 light,here is a list which is about what light will lit up when the charging system is fail,this is according to model and engine :

GASOLINE

2.0T I4(MK1) : Exhaust Temp Light , AT-Temp Light , And a Battery Light

2.6 I4 (MK1) :AT-Temp Light, And a Battery Light

2.6 I4 (MK2) :AT-Temp Light,And a Battery Light

3.0 V6 (MK1) : Exhaust Temp Light , AT-Temp Light , And a Battery Light

3.0 V6 (MK2) : Exhaust Temp Light , AT-Temp Light , And a Battery Light

3.5 V6 (MK2) : Exhaust Temp Light , AT-Temp Light, And a Battery Light

_______________________________________________________________________________________________________
DIESEL

2.3TDI(MK1) : Glow-Plug Light "glow from red to green" ,Water In Fuel Light , And a Battery Light

2.5TDI(MK1) : Glow-Plug Light "glow from red to green" , Water In Fuel Light , And a Battery Light

2.5TDI(MK2) : AT-Temp Light , Water In Fuel Light , And a Battery Light

2.8TDI(MK2) : Glow Plug Light "glow from red to green" ,Water In Fuel Light, And a Battery Light


*Glow-Plug Light will illuminate only to the model which is equipped with a Single Relay Pre-Heat System
*AT-Temp Light will illuminate only to the model which is equipped with an Autobox
*Exhaust Temp Light will illuminate only to the model which is equipped with a Exhaust Gas Temp Monitoring System (EGTMS)

Here's a Pic showing a MK1 Warning light :




_______________________________________________________________________________________________________
Here's are few symptoms of when your Alternator are about to gone:

1)The Glow-Plug ECU will click non-stop when there is an electrical load,eg. Head lamp, AC are turned on and the car are idle at below 1000Rpm.....when you rev it the noise will gone but will come back once the engine is idle.....

2)The Alternator L-Terminal start to give out Voltage when the Ignition is off and give voltage higher than 4V when the ignition switch is on but the engine is stopped.....

3)When a known fully charged battery are installed in the Pajero,if the Voltage of the charging system is fluctuate according to rev eg. when at idle the voltage was 12.8 but when rev to 2000Rpm it goes to 16V......

_______________________________________________________________________________________________________
Some diagnostic to show condition of your alternator:

1)Connect a Voltmeter across the battery terminal,Start the engine and observe the voltage:

12.8V when Idle but will go over 16V when the engine is revved to 2000RPM = The internal Regulator is faulty
_______________________________________________________________________________________________________
12.8V when idle but will climb to 13V but will not go over 13V and you heard a belt slipping noise=Check the tightness of the Drive Belt
_______________________________________________________________________________________________________
11.9V when idle but will not change or fluctuate a little bit when the engine is revved= Alternator are not charging,check the wiring,if the wiring are intact,the alternator are faulty
_______________________________________________________________________________________________________
14.5V when idle with no electrical load but drop to lower than 13V when all electronics are turned on to give full electrical load= Alternator Ampere/output aren't enough to cope with the electrical load
_______________________________________________________________________________________________________
14.5V when idle with no electrical load and when all electronics are turned on to give full electrical load,the voltage maintain above 13V- 15.5V,the charging system is perfectly normal

*Sometime when the battery is fully charged,the voltage when the engine is idle and no electrical load is above 13V only