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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Posted on Jan 02, 2017

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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:
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Have some one check the charging system for output. Have them check for voltage drops in the battery cables and the charging circuit.

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Have the charging system tested . Voltage drop test power an ground circuits for the Engine management system . Do you know how to do automotive electric system testing ? Bad ground circuit probably , engine ground cable maybe . Test for B+ voltage on the engine . The alternator is controlled by the PCM - engine control module . The battery light is controlled by a serial data message from the PCM to the instrument cluster . Do you know anything about serial data communication networks on automobile's ?
The Trainer 47 What measuring voltage on the ground side means
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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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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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