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redpoint5 01-02-2014 06:10 PM

Alternator Stopped Working (2001 VW Golf 2.0L)
 
My friend has a 2001 VW Golf 2.0L that stopped charging. Battery voltage was 11.5 volts unloaded, and with the engine running stayed at the same voltage. I figure he could have a bad ground, bad fuse, bad relay, or bad alternator.

I charged him up enough to get the car to a European mechanic, who wants to charge $340 just for the alternator. The mechanic also said it needed to be replaced without doing any diagnostic at all except for what I had already done.

I found a black wire going to the alternator and measured resistance to ground, and found it open. Should the wires circled in the picture below show continuity to ground?

http://i7.photobucket.com/albums/y26...m/KIMG0179.jpg

My friend doesn't have much money, and I don't like the "replace parts until it starts working" philosophy of repair work. If you know what I can check, and where to look, that would be great.

t vago 01-02-2014 06:16 PM

The smaller wire is the field excitation signal from the engine computer. The larger wire goes to the positive terminal of the battery. Neither wire should show a connection to ground.

My question is: Where is the serpentine belt?

Frank Lee 01-02-2014 06:34 PM

Yeah, where's the belt?

Also that little wire looks pulled tight to me... if there is a fault with it, I'd suspect a break in the wire right at the connector where it is pulled into a hard bend.

Oh, and friends don't let friends have newer VWs... AND THE $340 ALTERNATOR IS THE REASON WHY.

redpoint5 01-02-2014 08:20 PM

Thanks guys. I'll see if I can keep my friend from the poor house...

The belt is on the alternator, it just has the ribs out.

Frank Lee 01-02-2014 10:12 PM

Is the belt flipped? Maybe it has no traction and nothing is spinning properly.

user removed 01-02-2014 10:33 PM

Some serpentines ride pulleys on both sides.

regards
Mech

t vago 01-02-2014 10:36 PM

All the alternators I have ever seen had the serpentine ribs contacting the pulley surface. The above picture is not showing that.

redpoint5 01-03-2014 02:15 AM

Now I'm confused...

Looking at pictures from a Google search, it appears the belt is ribbed on both sides.

http://www.iloveme.net/otherpics/tensionerbefore.jpg

http://img.photobucket.com/albums/v3...y/DSC09222.jpg

http://upload.generationdub.com/images/DIYserp06.jpg

http://quirk-images.com/ebay01/vw2/06A-260-849-C-x.jpg

NachtRitter 01-03-2014 02:17 AM

EDIT: Posted at about the same time as redpoint did... hadn't ever seen a belt ribbed on both sides before... cool!

Was also trying to find a pic of the routing, and this is what I found:
http://i340.photobucket.com/albums/o...project_88.jpg

No AC on that one though...

From DIY: Serpentine Belt Replacement 2.0 / 1.8T (MKIV)

redpoint5 01-03-2014 11:19 PM

Update:

My friend found a re-manufactured alternator for $130 and the absurdly expensive European automotive shop charged $100 to put it in. $230 out the door... and I warned him about buying a VW. At least he is saving a ton of money in gas now that he's out of his Ford Exploder.


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