Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

Lost Tac display

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  #1  
Old 07-31-2012, 04:43 PM
ed cavender's Avatar
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Default Lost Tac display

my 94 6.5 tac has been operating irratically now it has completely quit. anyone have wireing info?
 
  #2  
Old 08-01-2012, 11:54 AM
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I believe the tach is fed signal from the alternator. Thats all I know.
 
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  #3  
Old 08-02-2012, 11:30 PM
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Default cant find anything wrong

all alternator wiring seams to b ok
anyone else have a clue?
 
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Old 08-03-2012, 05:10 AM
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Could be either somthing internal on the altenator or maybe the connection tho the back of the instrument cluster???
 
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