odd electrical problem with gauges
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  1. #1
    Rods 'n' Sods Junkie supateach's Avatar
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    odd electrical problem with gauges

    Hello, I have a very strange problem with the celica gauges, i think this has been there since I completed the car but I have not noticed it before. The car went tax exempt last year and before that I only taxed it for the summer, so was never driven after dark with lights on. Now it is taxed all year round and gets used in the dark occasionally i have noticed this strange thing happening. With the engine running when I turn on the sidelights the fuel , temp and oil pressure gauge all go up about another 1/4 of the way up the gauge, if i turn on the headlights the same thing happens. The ammeter dips momentarily when I switch on the lights and goes straight back to just positive. If I turn on the lights when the engine is not running the gauges stay steady. The wiring is original celica and there does seem to been a voltage stabiliser for the gauges on the wiring diagram. Everything works OK but I would like to sort this, any ideas. Thanks

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  3. #2
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    The first thing to check when you have issues with multiple related items is the earthing of the gauges

    I'm surprised there's no IVS, in fact I'm amazed ...... I'd look again

    Further afield if it's an older Celica it may have an externally sensed / regulated alternator and when you load it up the voltage is spiking ..... have you put an ACCURATE external volt meter and got someone to observe the voltage the moment the lights are put on ?

    And that's just the basics

    John

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    Administrator blackpopracing's Avatar
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    I'd be checking the voltage stabiliser still works.

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  6. #4
    Off the Xmas card list kapri's Avatar
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    I had this but only on the temp gauge.Entire instruments ystem was on a voltage reg . Turned out to be too high output from alternator due to blown diode.

  7. #5
    Rods 'n' Sods Junkie supateach's Avatar
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    alternator is new, internally regulated, cheap Chinese but appears to work perfectly, will check wiring diagrams again but have had whole wiring loom out many years ago and cant recall a voltage stabiliser would probably be behind dash I think.

  8. #6
    Off the Xmas card list kapri's Avatar
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    Don't rule the alternator out cos it's new Stick a voltmeter on the battery whilst getting someone to rev it up .

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