Have a load test on your battery and test the output of your alternator. The starter needs a strong battery to crank and the motor needs sufficient power to run all of the electronics IE: ecm, sensors, injectors, etc. Could explain why it cut off.
So I started the tests that you linked to. Had to jump start it first. Once I got it started, Battery voltage was 10.3:thumbsdn: and when I tested the PCV terminal, I got the same (battery voltage). After a few minutes of running I again checked battery voltage and watched it drop from 10.3 down to 7.2 in about five seconds. That sure sounds like a bad alternator to me, but is there some quirky thing about Beetles that may give the same result? Thanks.The problems you report are often related to bad connections in the fuse panel above the battery. Check and make sure the connections are all good. See this DIY for photos:
The last photo is of the connections in the fuse panel. Make sure the nut circled in the fourth photo is tight. Once all this checks out, measure the battery voltage with the engine idling as shown in the fourth photo. You should get over 14 volts if the alternator is good. Often the only problem with an alternator is worn brushes, which are much cheaper to replace than the entire alternator. At this point a '99 should have had its alternator brushes replaced already.
Look on YouTube for a removal video on a 2.0 Beetle, Jetta, or Golf. I don't think you need to remove the front end, Good Luck!I just picked up a Haynes manual for the alternator removal. Are you kidding me! ? Remove the front clip? ?? Fabricate special tools with threaded rod? Memory saver? Please tell me it's not this much of a PITA. No wonder we have a love/hate relationship with these cars. I can't even test the alternator without disconnecting the battery, and can't do that without a memory saver. Anyone have any ideas or tips? Thanks in advance.