Why is the alternator on my Jetta not charging?
Cables ok, fuse 11 ok, tried a new battery, other battery showing 12.5 volts, system now charging 16.8 volts, dropped after about 10 minutes, noting that if engine raised above idle tact and insturment cluster shut off, I guess high voltage protection? After 20 min road test battery died, any sugestion on changing pcm?
What are the volts on a Volkswagen Jetta?
Have jetta, with 90 amp bosh alt. Shop test alt it puts out 100 amps when tested, battery checks out at 235 amps cold crank, cables cleaned tightened, when car first started, volts will display 13.8 to 14 after car runs a few minutes less than 5, voltage drops to 12.5 then to 12. Not sure what steps to take now? have the same problem?
What should battery voltage be when alternator is not charging?
The alternator is connected to a set of belts which when loose can cause it not to function as required. To differentiate an alternator problem from the battery, you will need to use a voltmeter to check for voltage. First, turn off the engine and check the battery voltage. A fully charged battery should have a reading of 12.65 volts.
What should I do if my alternator is not working?
The solution is to check your car’s manual for the particular fuse that controls the alternator and replace it. In some cars, you might also find another small fuse to the alternator’s control—usually a 15A to 20A fuse. An alternator does usually has 3 or 4 wires to it to function properly.
Are there any problems with the 2003 Volkswagen Jetta?
The 2003 Volkswagen Jetta has 615 problems & defects reported by Jetta owners. The worst complaints are transmission, engine, and windows / windshield problems.
Why does my VW Jetta lose power while driving?
Purchased 2011 vw Jetta car recently for my daughter. It drove ok for a short while but then lost power while driving. First the radio turned off, then several lights turned on on the dash and the steering became hard. Finally the car turned off. I managed to pull off the freeway. After this, it would not start.
What to do if your VW wont start after a battery change?
Leave the cables disconnected for fifteen minutes If this doesn’t yield results, then you can try this alternative method to get your key to reprogram itself: Ensure that the battery is being charged with a charger Leave the key in the ignition with the battery on and the engine off for an hour
What happens when you change the battery in a car?
Changing your car battery may cause your immobilizer to lose synchronization with the car. When you disconnect your old battery from the car, you wipe out your car’s settings unless you keep the voltage in the car going. You want to keep a back current flowing to your car to retain its computer settings.
What does the battery light mean on a VW Jetta?
If your alternator is no longer capable of charging the battery, the battery light will come on. It’s a warning light that indicates that the voltage in the battery is not sufficient. The alternator may be charging still, but just not enough to cover the electrical needs of your Jetta.
How big should the fuse be on a Jetta?
Ther should be a110 or 150 amp fuse depending on the engine size. Also test continuity from alt to fuse on big wire (black) Unfortunatly the PCM (computer) controls the alt charging in this car, so the problem may go deeper than just an alt. Also check fuse 11 behind the dash, it is part of the circuit as well helpful?
What causes an alternator to go over base voltage?
If you are getting more than 2 volts above base voltage, most likely your alternator is over-charging the battery or the battery is faulty. Other potential problems are a faulty voltage regulator or a problem in the charging system wiring.
How can I tell if I have an alternator problem?
To differentiate an alternator problem from the battery, you will need to use a voltmeter to check for voltage. First, turn off the engine and check the battery voltage. A fully charged battery should have a reading of 12.65 volts. Next, turn on the engine and recheck the voltage. You should have a reading of 13.5 to 14.5 volts.
Can a bad alternator cause a car to die?
An alternator being bad can often result a car constantly killing batteries or die after jump starting. Take a look in the video for more details on this MK5 Jetta Alternator https://shopdap.com/catalog/product/v… https://shopdap.com/vw-audi-torx-sock… https://shopdap.com/make-model-year/v… https://shopdap.com/8-piece-magnetic-…