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Author Topic: Problem with gauges  (Read 3768 times)

June 15, 2008, 07:24:30 pm

webman

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Problem with gauges
« on: June 15, 2008, 07:24:30 pm »
I am having a wierd problem with my gauges.  I have a 91 Jetta diesel.  Then I first start the car I have no tach.  When I start driving, it suddenly starts working and works fine for the trip.  If I shut off the car and start it again, I get the same problem.  Is this a problem with the alternator?
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Reply #1June 15, 2008, 07:44:18 pm

jimfoo

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Problem with gauges
« Reply #1 on: June 15, 2008, 07:44:18 pm »
The alternator has to reach a certain rpm before it starts charging. After it starts charging, it can drop below that rpm and still charge. It is normal on a lot of alternators. I imagine that is your problem.
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Jim
1966 Land-Rover 88" with 1.9 1Z which has been transformed to an M-TDI
TFO35 mechanically controlled VNT, IC , and 2.5" exhaust.
Driven daily
Reply #2June 15, 2008, 11:20:57 pm

Vincent Waldon

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Problem with gauges
« Reply #2 on: June 15, 2008, 11:20:57 pm »
Betcha the red alternator light comes on as well when you first start the car.... if you blip  the throttle the red light goes off and the tach starts to work?
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Vince

Edmonton, Alberta, Canada
2001 silver TDI Jetta Malone Stage 1.5 , 2001 blue TDI Jetta SBIII 216s Malone Stage 3, 1970 Bay Window bus

Gone but not forgotten: 1969/1971 Beetles, 1969/1974 Westies, 1979 Rabbit, 1986 TD Jetta, 1992 gas Jetta, 1994 TD Jetta
Reply #3June 17, 2008, 07:48:46 pm

webman

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Problem with gauges
« Reply #3 on: June 17, 2008, 07:48:46 pm »
Tracked it down to the D+ wire.  It was broken.  It preloads the alternator.  Reattached, and everything works great now.
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