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Old 04-09-2011, 02:32 PM
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Default 2001 Jetta VR6 electrical problem-low batt voltage

Have a 2001 VW Jetta VR6 with an electrical issue. Battery voltage when running, varies between 11.9 and 12.5. The alternator and battery have been replaced, no change. It appears something in the car is dragging it down. Also the instrument cluster has missing functions like speedometer and tach needles and the LED display. I'm assuming all of this is related. Any suggestions on where to start? I'm good at using meters. Thanks
John, Buies Creek, NC
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Old 04-09-2011, 07:05 PM
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It's probably the alternator or an sensor
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Old 04-09-2011, 07:55 PM
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Check all the ground cables are tight between battery, alternator, transmission and chassis. Also, especially for your model year check the integrity of the +ve cable from the alternator where it attaches to the fusebox above the battery area - make sure the crimp is good and the stranded wire in the cable has not starting greying in color and going bad as this causes a resistance drop and also causes the fuse box to melt when that connection overheats..
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Old 04-09-2011, 10:58 PM
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Not sure if vw's are set up the same as my others but check the positive cable at the starter. Get under the dash and look for any loose wires or cracked wires and do the same in the engine bay and like someone else said check all the ground wires in the engine bay.
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Old 04-10-2011, 04:05 PM
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Default new alternator bad

Thanks for the replies.
Removed alternator and returned to store, bench tested bad. Either it was bad out of the box or a defective battery damaged it. (or even the car somehow). When I pick up the replacement, I'll get them to bench test it before I install it. If if does the same thing, I've got serious problems elsewhere. I'll post what happens. Thanks
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Old 04-10-2011, 06:05 PM
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Good luck
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Old 04-14-2011, 07:16 PM
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Before I installed my 2nd alternator, I decided to replace the alternator wire with 4AWG wire. Now get 13.8-14.2V. I'm sure it was the cable even though it wasn't discolored. Hope this helps someone else. Now, on to the instrument cluster....
thanks to all
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