Why is the alternator low on my Golf Mk4?
The battery voltage is a little low at 11.8v (probably because it’s not charging well/at all) but it does seems that the alternator is doing something as the voltage rises to 13.4v when the engine is running. Faulty voltage regulator, perhaps? Or worn brushes? Any ideas what I can check next to diagnose further?
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.
How do you test an alternator voltage regulator?
This test is a simple procedure to check alternator voltage regulator output. You need a digital multimeter for this test. Set the parking brake and shift the transmission to Neutral (manual) or Park (automatic).
How to remove an alternator from a VW?
This is a common VW failure, and is a VERY easy DIY. Before removing the alternator, you will need to remove the serpentine belt, and tensioner. Check out the other Salvage yard DIYs ~ https://www.youtube.com/playlist?list… Subscribe to Humble Mechanic ~ http://www.youtube.com/user/humblemec… https://www.youtube.com/playlist?list…
What happens when an alternator has an electrical problem?
After the engine starts (thanks to the high voltage provided by the battery), the alternator provides the electricity required to power the car’s many electrical functions, including the lights and radio, the spark, charging the battery, and others. What Happens When Your Car Has an Electrical Problem?
Is there a jumper cable for a TDI?
Jumper cables work but it’s best for a car which is only a little low. TDI are also designed to not inject fuel unless the cranking speed is high enough so low cranking means you don’t even have a chance for engine start. Did you find the recommended reading relevant to this discussion?
Why is my alternator low at 2500rpm?
This doesn’t change if you rev above 2500rpm. The battery voltage is a little low at 11.8v (probably because it’s not charging well/at all) but it does seems that the alternator is doing something as the voltage rises to 13.4v when the engine is running. Faulty voltage regulator, perhaps?