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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old September 23rd, 2009, 15:51   #1
festivenuts
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Default TDI Alternator Gas Alternator Swappable?

My 1999.5 TDI alternator clunked out.

Am I able to use a Gas VW alternator from the same year?
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Old September 23rd, 2009, 16:45   #2
compu_85
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You will probably have to exchange the pulleys, but yes they are interchangeable if they are the same power rating. My guess is the gas car will only have a 90 amp, though.

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Originally Posted by BRUSSELS BELGIAN View Post
Maybe I should pay MYSELF to do bad work on my car!
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Old September 23rd, 2009, 17:09   #3
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Actually the pulleys are both 6-rib systems. Most of the '99s regardless of 2.0, 1.9, 1.8T or VR6 should all have 120 amp systems. If you have a 90 amp it's a rarity.
-BB
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Old September 23rd, 2009, 19:05   #4
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I doubt that the pulley on the gasser is a one way clutched pulley, but I could be wrong.
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Old September 23rd, 2009, 19:39   #5
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Quote:
Originally Posted by BleachedBora
Actually the pulleys are both 6-rib systems. Most of the '99s regardless of 2.0, 1.9, 1.8T or VR6 should all have 120 amp systems. If you have a 90 amp it's a rarity.
-BB
Wrong.

Autos were all 90 the manuals were 120.

Swap the pulley or better yet get a new one. The key is it has to have a sprague clutch in it.
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Old September 23rd, 2009, 19:39   #6
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Quote:
Originally Posted by dogdots
I doubt that the pulley on the gasser is a one way clutched pulley, but I could be wrong.

Solid one on the gassers.
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Old September 23rd, 2009, 19:41   #7
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You're right, momentary insanity
Still, I stand by they should all be 120a systems!
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Old September 23rd, 2009, 19:45   #8
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I've installed many 120A alternators in 90A cars... IIRC they all should be the same
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Old September 23rd, 2009, 19:47   #9
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I agree and install only 120's.
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Old September 23rd, 2009, 21:13   #10
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Quote:
Originally Posted by jasonTDI
I agree and install only 120's.
Me too... It doesn't make sense to put the 90 back in..
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Old September 25th, 2009, 10:35   #11
festivenuts
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Am I able to install an alternator from a 2003 VW Beetle? (120 amp) In my 1999.5 golfy?
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Old September 25th, 2009, 10:50   #12
Turbine Suburban
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Forgot: Why does it have the clutch?
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Old September 25th, 2009, 11:12   #13
festivenuts
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could it be a screwy regulator issue?

i left for 2 months and returned to a dead battery and alternator that's not charging
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Old September 25th, 2009, 11:30   #14
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Quote:
Originally Posted by Turbine Suburban
Forgot: Why does it have the clutch?
I'm curious too as to why the TDI alternator has a one way clutch.
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Old September 25th, 2009, 12:07   #15
compu_85
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To make the crankshaft pulley's life easier, and to make the alternators life easer. Go watch a gasser or early TDI... rev it up and let it return to idle, you can see the stress on the belt go the other direction for a moment.

-Jason
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99.5 Jetta "GLX" TDI. 323,000 miles. Power Memory Seats, HIDs 11mm pump, BV39 Turbo, RCIII 36/47 MPG. Sold to JDSwann's Brother.
2012 Passat SE TDI DSG. 114,000 miles. LED tails, Memory Seat, HIDs. Bought back by VW.
2004 Touareg V10 TDI. 165,000 miles. Sold to Matt98AHU w/ flat camshafts.
1988 Audi 5000S Quattro, 1992 Jetta ECOdiesel, 1991 Jetta ECOdiesel.
Thank you for giving me the BUG*PWR award. It means a lot to me!

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Quote:
Originally Posted by BRUSSELS BELGIAN View Post
Maybe I should pay MYSELF to do bad work on my car!
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