Question about 1999 Volkswagen Jetta

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Charging problem Hi, We have a problem with the charging system on a 1999 Bora. The voltage slowly drops on the battery while the car is running. We took the alternator out and had it tested and it checks out fine. Checked all of the fuses and they're good. The wiring connections also seem fine. Where do we check next? The plug that goes on the alternator seems like it might be a good candidate if I knew where the other end goes...Thanks, Dave

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The voltage regulator on the newer cars are in the pcm(computer) if its bad then the computer will need to be replaced but it sounds to me like it is alright. is the battery dieing out? if not, the alternator and the voltage regulator is working properly

Posted on Aug 26, 2008

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2.2 motor. Where is the fuse link for the charging system located?


the fuse is ok as you have a reading on the gauge
the problem is in the alternator or regulator or battery
charge lights work from a positive and a negative current flow
when you turn the key on the current flows in one direction through the light to the alternator and so it lights up
when the engine is running the alternator is charging ( normally at a higher voltage than the battery and so a current is directed back through the light to the battery
these two opposing currents mean that there is no current flow through the light and so it goes out
however if the batter has failed ( 9 volts is a good indication ) then the 14.5 volts will will produce a current back through the bulb and it will again light up
I would have the battery load tested as it may have an internal fault and not accept the charge from the alternator

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Volts slowly drop to where what quits ,The vehicle stops running ? Is the charge indicator light lit on the instrument cluster /? are any lights lit on the instrument cluster ? The instrument panel cluster (IPC) illuminates the charge indicator and the BATTERY NOT CHARGING message is displayed in the message center when the following occurs:
The engine control module (ECM)/powertrain control module (PCM) detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the ECM/PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the body control module (BCM) indicating the system voltage.


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The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.


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The ignition is on, with the engine off

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If you swap the battery positions, does the problem move to the RHS ?

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i think it's time to replace the battery. have you tried to crank it after someone gave you a jump? if it starts than replace the battery. there's no real way I can tell you how to check the charging system unless the car is running.

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Car turns over slowly, wont start


Put a volt meter across the battery terminals. You need at least 12v there in order to get the starter turning. If voltage is less, have it charged and load tested then try again. If it still turns too slow, put the volt meter back on and check voltage while turning. If it drops below 9.5 volts while cranking the starter is likely at fault and needs replacement.
If you have a security system make sure you know how to re-arm it before removing the battery. Check the charging system after you get it started. and make sure belt is not slipping as well.

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My 95 ford thunderbird started right up in the morning, i drove it about 10 miles and shut it off about an hour later i went to start it and it made a loud click and it wouldnt start, nothing works like...


check battery cable for tightness and no corrosion.if all is well charge the battery or jump start it. while engine running check to see if the alternator is charging it.it should be 13.5 to 14.5 volts while engine idling.turn off engine battery voltage should be 12.5. if drops to 11.0 to 10.0 volts.battery is weak.if car running the voltage should be 13.5 to 14.5 volts alternator is charging. if the voltage is 11.8 to 11.0 volts. alternator is not charging.

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Your battery may not be holding its charge. Charge the battery and take a voltage reading. Then after a few hours take another reading andsee if the voltage has dropped. If that is alright, refit the battery to the car. turn off all the electrics anddo a voltage test. If the battery is discharging then ou will have to find what componant is drawing the voltage. I normally check the boot through the rear seats first.

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