Asked in AlternatorsVW JettaDIY Projects
How do you know when your 01 jetta alternator is bad?
September 24, 2009 6:05PM
if after jumpstarting you're car and letting it run for a while then shutting it off the vehicle doesn't start again. one of two things are wrong. either you're battery isn't holding charge and you need to replace it. or the alternator isn't properly charging the battery while the vehicle is running. first i would buy or find a new or properly working battery and replace the one in you're vehicle. if it still won't charge you're alternator is most likely bad and needs replaced.