Question about 2002 Volkswagen Passat

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How can I check voltage on alternator? I have put a new battery on diesel passat. after a few days , the battery is flat and I havre to put on charge/ the red light is not on. tony@obmtec.com

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Try changing the alternator - it may be cheaper in the long run - used spares can be very reasonable and an alternator is easily fitted.

If the diode valve pack has gone in the alt. then the readings would be out anyway - this is the more common fault.

Posted on May 01, 2010

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Posted on Jan 02, 2017

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2004 Nissan Altima 3.5L BATTERY LIGHT went on during 15 minute drive. Next day car "died" while idling after a 20 minute drive. BRAKE WARNING LIGHT & BATTERY LIGHT on prior to full electrical failure.


Start with checking the alternator voltage with a multimeter. With the car off check the voltage in the battery which should be holding 12v charged less if flat of course then start the car and test the battery again. If the alternator is good you should be getting a reading of 14 to 14.5 v if it's the alternator it'll A) not put any charge into the battery or B) be a very low voltage being anything under 13.5 v

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2000 Cavalier 2.2: Put in new starter. 2 days & it


The battery and alternator may have been ok.
You have a fuse or fuseable link between the alternator and battery to protect it. If you have battery voltage at the battery post and not at the alternator post, there is a break in that circuit.
If the battery cable goes to the starter, the alternator wire may go from there and that could be where the fuseable link is.
Fuseable links are special thin wires that act like fuses.

Jan 11, 2013 | Cars & Trucks

2 Answers

Vw passat no power and no crank


Dear Sir:
See the diagrams attached and proceed with logic system troubleshooting. Look for vibration, loose wires, dirty, dust, corrosion, solenoid defective.
God bless you

5_25_2012_9_15_54_am.jpg5_25_2012_9_16_19_am.gif5_25_2012_9_17_04_am.gifYou can bypass the switch ignition connect one side to the positive batery and the other in the starter solenoid, must be RUN, and isolate the problem.
5_25_2012_9_18_22_am.jpg

May 24, 2012 | 1998 Volkswagen Passat

1 Answer

VW Passat estate Diesel 2.0 TDI 2007. Car has intermittent electrical Fault after 10 minutes driving on road the dash board power cuts out and engine stops, dash board only has led clock and mileage...


check battery cables make sure they are clean and tight and make sure the alternator charging battery. first check battery volts. should be 12.6 volts. with engine running alternator out put at battery should be 13.5 - 14.5 volts. if not either alternator failed.check alternator power feed wires and voltage regulator wires for damage or make sure electrical wires has tight connection.check alternator battery.first turn off radio before before disconnecting negative battery cable.

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3 Answers

I replaced the battery in my 01 volkswagon passat, it ran for a while then the engine slowly die, instrumental lights dim and the car cut off. It started again after a jukp but, continued the same process....


The alternator is shot, The car will run on a new battery for about 20 mins, then it fizzles out. The alternator contains the regulator, You can take it and get it checked, but I'm sure that is the problem, get your battery charged up while you do the alternator,and keep an eye on the charge light. Make sure it is charging, just because it is new doesn't mean it is good. Hope this helps.

Oct 07, 2010 | 2001 Volkswagen Passat

1 Answer

MAY NEW ALTERNATOR PUTS OUT 14 VOLTS WHEN I START THE DIESEL 5.9


the voltage regulator is in the computer,check you battery with volt meter with engine off it should say 12volts then check it again with engine running and it should say 14-15 volts. if not the you will have to take it to a dealer to check the computer,hope this will help you!!!

Apr 19, 2010 | 2002 Dodge Ram 3500 Truck

1 Answer

Car won't start. Replaced battery. worked 3 days. They said it was the alternator. REplaced with new. worked another 4 days. had it check with advance auto said battery good, starter cranking normal....


if there is no charging then its back to the alternator or the way its hooked up? did you recharge your flat battery with a mains charger after it went flat the first time? as no alternator will charge a battery from flat to fully charged,,,,even if you drove around the world none stop! the new alternator may have given up working becouse you overloaded the voltage regulator trying to recharge a flat battery witch would mean it was very week to start with?

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2 Answers

1989 Ford F250 7.3L Diesel. Bat light came on then smoked the VR


Thats a guessing game, but first, if the battery light was on, that means no alternator output. So recharge the batteries and be sure they are good, Then replace the alternator. If the batteries and the alt are good, and the battery light is off, then all should be OK.

Nov 15, 2009 | 1992 Ford F250

1 Answer

Battery flat wont start all lights are on abs,afs,battery,handbrake,plus power stearing light as well jump start car got it running still all lights stayed on thanks


may be that the alternator isnt supplying enough voltage and the system isnt working correctly due to that,put a new battery in dont just jump start not always ideal

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2 Answers

1999 ford escort zx2 alternator works brand new battery but battery isnt charging !


you will have to check the voltage whith the engine running .should be 13.6 or better

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