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Thread: Dead Tacho

  1. 17th November 2006, 12:11 PM #1
    Stepho_62's Avatar
    Stepho_62
    Stepho_62 is offline Master
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    Unhappy Dead Tacho

    I pulled my dash out of the defender and found an unholy mess where the previous owner or someone had installed the Tacho. I've tidied it up and pluged the tacho back in but it wont work. Its only got 3 wires on it not including the lights (- + and the sense wire) so I suspect when I dropped the facia unit with the tacho in it it killed said instrument . Bugger Oh well back to th Auto parts shop I go.

    Anyone got any suggestions on testing these beasts?
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  2. 17th November 2006, 01:39 PM #2
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    Quiggers
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    Depends how hard it impacted; why not remove the tacho and (temporarily) wire it direct; as in +- to the battery and the sensor to the coil - if this is the right config for your vehicle? - or wherever the pickup is for the tacho.

    Or co-incidentally, maybe a fuse let go, given you were in there and there's maybe a short from a pinched wire....

    GQ
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  3. 17th November 2006, 07:57 PM #3
    zwitter
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    Tacho probs

    You can start by checking the +- they should have 12 V accross them.
    The sense wire comes from the W terminal on the Alternator. you can also measure this line and it should have a voltage on it when running and may seem to increase with revs slightly at low revs but is actually the frequency that matters


    I would check voltage then continuity of sense wire to Alternator

    Good luck

    james
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