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Speedo & RPM not working sc400

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Old 09-19-11, 08:26 AM
  #16  
lcrusader
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so speedo went out again, could something be causing the vss to go bad?
Old 09-19-11, 10:14 AM
  #17  
bugjug
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yes, check wiring for shorts or opens/stretched wires
Old 10-18-11, 06:45 PM
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so it still not working after the cluster has been rebuilt, I noticed that the N light does not turn on, same for the shifter area. Anyone have any ideas what that is?
Old 10-19-11, 02:47 PM
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lcrusader
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bump, so here are the things I found that are not working... I haven't tested the cruise control yet but I will

Speedometer
Odometer
Tachometer
Neutral Light in Cluster
Neutral Light in Shifter
Old 10-19-11, 03:53 PM
  #20  
O. L. T.
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You can look in my gallery for the diagrams to the cluster and trace those wires.
Old 10-19-11, 07:05 PM
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lcrusader
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so I have confirmed that cruise control also doesn't work.

I have looked at the diagram and also the alldatadiagram. Signal from the source system goes to the tacho and speedo. There is a 10A fuse there which is fine (tested).

Basically

From
Power Source System > 10A GAUGE > Tacho
Power Source System > 10A GAUGE > VSS > Speedo / Trip Meter
A/T Indicator SW > Neutral

haven't looked at cruise yet, all of those are connected to the harness that goes to the ignitor and transmission vss.

Also, can a loose battery connection cause all this?
Old 11-07-11, 10:48 PM
  #22  
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just to answer the thread, finally found the answer...the harness behind the engine was stretched some how and we just replaced it with a new harness.
Old 11-07-11, 11:29 PM
  #23  
CrazySC300
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So you're golden now?
Old 03-19-17, 01:00 PM
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it could be the sc400 wire harness for the cluster instrumental
these cars are known to have many electrical wiring problems
Old 10-05-18, 07:58 PM
  #25  
pishta
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Originally Posted by BAMASOARER
Slappa da dash!
worked for me but now even a slap wont wake it up....? I did get the radio fixed thouth...replaced it. Sounds great now. Old one was muddy at times, like the pre-amp was out.
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