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Thread: Tachometer stops working when lights on

  1. 8th October 2013, 12:14 PM #1
    scharkie
    scharkie is offline Fossicker
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    Tachometer stops working when lights on

    Hi, I have a 96 model. When I start the car the tachometer is abit slow to start. When I turn the driving lights on it stops. I have to turn the aircon on for the tachometer to start again. Has anyone come across this before?
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  2. 8th October 2013, 12:40 PM #2
    bee utey's Avatar
    bee utey
    bee utey is offline AT REST
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    Tacho is driven by a wire off the back of the alternator. Check the small white/grey wire for looseness, also check that the drive belt isn't slipping. Your alternator may also be stuffed, check the output voltage with the lights on, engine running.
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  3. 13th October 2013, 09:07 PM #3
    DiscoMick Guest
    Ditto the above. When my alternator started working erratically, the tacho would stop. Then they both stopped. Alternator was rebuilt, tacho resumed action, then became occasionally lazy. Got the alternator checked and it fine. Electrician changed the tacho connection and it improved, but still happens occasionally. Full set of new belts, so I assume that's not the problem. Hope that helps.
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