740 Instrument Cluster Woes

Discussion in 'Volvo 740' started by jimb, Oct 31, 2008.

  1. jimb

    jimb Guest

    Good day,

    I have an 85 740 that just developed an issue with the instrument
    cluster warning lights.

    After starting the lights remain on as the car is running.

    I have not driven the car more than a few feet.

    Fuel gage and speedometer have always been flaky

    Speedo has been inoperative for some time.

    Fuel gage works most of the time and will respond to tap on gage. Now
    it's dead. I got as far as checking the connection in the boot/trunk.

    Is there a relay or black box that controls the lights?

    Does the cluster get ground on the "A" pillar? Near the computer?

    I have often suspected the c luster grounds for such things as the
    Speedo and fuel gage.


    jimb, Oct 31, 2008
  2. jimb

    James Sweet Guest

    If your alternator is not charging, the lights will be on. Check the
    belt, check the voltage regulator, easiest way to do the latter is put a
    volt meter on the battery and see what it reads, then start the engine,
    it should be substantially higher, more than 13V. The lights are
    controlled by the individual features they monitor rather than by any
    one central location, but a charging fault will light them all due to
    the design of the system. Same is true of many cars.
    James Sweet, Oct 31, 2008
  3. jimb

    jimb Guest

    I am soooo stupid.

    I was in a panic for another reason and wasn't thinking right.

    Next day what to my surpise do I see sitting in the driveway?

    B R O K E N F A N B E L T.

    And on top of it, I had the hood open looking right at it!

    Some of the panic was my Usenet provider had just dropped the service.

    "Car broken... How am I going to get to the Volvo group to get this

    thanks James

    jimb, Nov 1, 2008
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