Alternator Intermittently charging... Pulling my hair out!!!!
#1
Alternator Intermittently charging... Pulling my hair out!!!!
Im having a problem with my 2000 ford ranger 2.5l manual... my alternator only charges sometimes... when the alternator is in the no-charge state the green/red wire only measures 1.34v... it does this off and on while the truck is running... shouldnt this always read 12v when the key is on run or start? or is this the out put signal to the batt light?... please some one help me... ive been at it for two days and i cant figure it out
#5
I have measured at the battery and confirmed it is intermittently charging... Like I said in the first post... The only thing I notice that is out of the ordinary while it's not charging aside from the fact that it is only reading 12.4 volts at the battery, is that it is Only reading 1.34v at the I terminal (green/red wire)... Why would this be?
#6
#8
The Light Green with Red Stripe wire goes to the warning indicator lamp in the dash.
With the ignition in the run position (engine not running) does the indicator lamp come on? If not, disconnect this wire at the alternator and ground it. Does the light now come on?
For a basic wiring diagram of charging system Click this link Charging Ststem
With the ignition in the run position (engine not running) does the indicator lamp come on? If not, disconnect this wire at the alternator and ground it. Does the light now come on?
For a basic wiring diagram of charging system Click this link Charging Ststem
#9
#10
The Light Green with Red Stripe wire goes to the warning indicator lamp in the dash.
With the ignition in the run position (engine not running) does the indicator lamp come on? If not, disconnect this wire at the alternator and ground it. Does the light now come on?
For a basic wiring diagram of charging system Click this link Charging Ststem
With the ignition in the run position (engine not running) does the indicator lamp come on? If not, disconnect this wire at the alternator and ground it. Does the light now come on?
For a basic wiring diagram of charging system Click this link Charging Ststem
#11
The following is a synopsis of the circuit operation:
With the ignition in the on position, voltage is applied through the warning indicator I circuit (Light Green with Red stripe wire pin 3 of the connector) to the voltage regulator. This turns the regulator on, allowing current to flow from battery sense A circuit (Yellow with White stripe wire pin 1 of the connector) to the generator field coil. When the engine is started, the generator begins to generate current. This current is then supplied to the vehicle’s electrical system through the output B+ terminal.
Once the generator begins generating current, a voltage signal is taken from the generator stator and fed back to the internal regulator. This voltage feedback signal (typically half the battery voltage) is used to turn off the warning indicator.
Checking system operation:
Using a DVM back probe connector with it plugged in to the generator. The voltage readings should be as follows:
Key on-engine off:
Pin 1 12 volts (Yellow with White stripe wire)
Pin 3 1-3 volts (Light Green with Red stripe wire)
Key on-engine on:
Pin 1 12 volts (Yellow with White stripe wire)
Pin 2 12 volts (Light Green with Red stripe wire)
If the readings are out of spec you have two options, one is to check the commutator rings. If there in fair condition, you could try replacing the voltage regulator and brush set. The other is replacing the alternator.
Here are a few links that may be of some help:
Video 2
With the ignition in the on position, voltage is applied through the warning indicator I circuit (Light Green with Red stripe wire pin 3 of the connector) to the voltage regulator. This turns the regulator on, allowing current to flow from battery sense A circuit (Yellow with White stripe wire pin 1 of the connector) to the generator field coil. When the engine is started, the generator begins to generate current. This current is then supplied to the vehicle’s electrical system through the output B+ terminal.
Once the generator begins generating current, a voltage signal is taken from the generator stator and fed back to the internal regulator. This voltage feedback signal (typically half the battery voltage) is used to turn off the warning indicator.
Checking system operation:
Using a DVM back probe connector with it plugged in to the generator. The voltage readings should be as follows:
Key on-engine off:
Pin 1 12 volts (Yellow with White stripe wire)
Pin 3 1-3 volts (Light Green with Red stripe wire)
Key on-engine on:
Pin 1 12 volts (Yellow with White stripe wire)
Pin 2 12 volts (Light Green with Red stripe wire)
If the readings are out of spec you have two options, one is to check the commutator rings. If there in fair condition, you could try replacing the voltage regulator and brush set. The other is replacing the alternator.
Here are a few links that may be of some help:
Video 2
#14
Old Guy User…
iTrader: (12)
Have you have the alternator tested by an auto shop that can do a load test ?
Also, if the alt tests OK check out the grounds in the engine bay, (battery to frame, frame to engine, frame.engine to body) add one from the body of the alternator to either the engine or the frame ground location. Also chk the engine to body ground.
Make sure all have good clean connections.
luck
Also, if the alt tests OK check out the grounds in the engine bay, (battery to frame, frame to engine, frame.engine to body) add one from the body of the alternator to either the engine or the frame ground location. Also chk the engine to body ground.
Make sure all have good clean connections.
luck
#15
Thanks guys... Pulled the regulator and the brushes and rings looked terrible... Parts store had one in stock so I just replaced the whole thing... So far so good... I'm gonna keep an eye on it though... Y'all are a huge help... Look forward to getting this truck closer to my goal with this forums help
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