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Rev counter not not working

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by mercmancdi, Oct 24, 2012.

  1. mercmancdi

    mercmancdi Senior Member

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    Rev counter not working on 95 e300 d ,any suggestion to most likely cause or how to check
     
  2. television

    television Always remembered RIP

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    Has it ever worked, does it have the original radio
     
  3. turbopete

    turbopete Senior Member

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    are these fed from the alternator or the crank sensor?
     
  4. television

    television Always remembered RIP

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    Crank sensor always
     
  5. OP
    mercmancdi

    mercmancdi Senior Member

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    Hi Malcolm only got car so don't know how long it has not worked , but its not org radio .
     
  6. EmilysDad

    EmilysDad Senior Member

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    I'm intrigued Malcolm :confused: :confused: what could be the connection with lack of tacho & an original radio?
     
  7. whitenemesis

    whitenemesis Senior Member

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    Speed signal?

    (sorry, my name's not Malcolm..)
     
    Last edited: Oct 25, 2012
  8. EmilysDad

    EmilysDad Senior Member

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    but what the connection with the radio ..... :confused:

    :lol: :lol: :lol:
     
  9. television

    television Always remembered RIP

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    The green/yellow wire that goes to pin 1 on the radio is the signal that increases the volume as the car goes faster, the wrong radio can short out this signal.
    Best to unplug the radio making sure that you have the code if needed and see if the rev counter works, if it does then clip the wire on pin 1, if it makes no difference the fault is elsewhere
     
  10. EmilysDad

    EmilysDad Senior Member

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    Easy when you know :lol::lol:
     
  11. television

    television Always remembered RIP

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    That is the big problem on here, many think I know nothing much
     
  12. Naraic

    Naraic Moderator

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    Yep, everyday can be a learning experience.
     
  13. whitenemesis

    whitenemesis Senior Member

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    "The only true wisdom is in knowing you know nothing."
    -Socrates
     
  14. toby1

    toby1 Senior Member

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  15. SL55 Mark

    SL55 Mark Senior Member

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  16. OP
    mercmancdi

    mercmancdi Senior Member

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    Very detailed answer Malcolm , if that turns out to be the problem I would never have solved it ,, will try your suggestion. Thank you
     
    Last edited: Oct 25, 2012
  17. television

    television Always remembered RIP

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    The problem is it just does not sink in with some people
     
  18. television

    television Always remembered RIP

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    It may not be that, in which case we can go further
     
  19. OP
    mercmancdi

    mercmancdi Senior Member

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    Will let you know .
     
  20. turbopete

    turbopete Senior Member

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    i know of many diesels that take the rev counter feed from the alternator. fords particularly. often if the alternator stops charging the rev couter stops working. it may be different on the newer common rail engines, hence why i asked the question
     

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