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Thread: Disco 1 Wiring prob needing urgent help!

  1. #1
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    Disco 1 Wiring prob needing urgent help!

    Background. I applied a probe to my front interior light to find a suitable hot wire for a roof mounted UHF radio. The dimmer effect confused me so I decided to run a wire down the pillar to under the glove box. All good, the radio works a well.

    The Problem. Whether the motor is going or not, as soon as you open any door, the music radio stops and its display disappears; the digital clock display disappears; and internal lights do not work. Within a few seconds (about the normal time for the dimmer to kick out) radio comes back on, clock is reset to 1.00, all provided the doors are closed. I have permanently lost all interior lights and glove box light.

    I suspect my initial testing of the front interior light has caused a short circuit in some way. What have I done and how can I fix it?

  2. #2
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    The hot wire you have chosen is on the interior light circuit.
    When you open the door you ground the interior light circuit and activate the timer relay.
    Find a new source for power. A good one if you want it switched is the cigarette lighter.

    Regards Philip A

  3. #3
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    did you tap your earth onto the earth for the roof lights...

    if so theres your problem.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  4. #4
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    Disco 1 Wiring prob needing urgent help!

    Thanks guys but the prob seems to be much deeper.

    PhilipA suggetsed to try a new circut for UHF radio. I detached it off the thick brown wire under the glove box and the problem remained the same.
    Blknight.aus suggested to tap the earth on the roof light. On the third attempt I found this wire and set it in position as it should, however the problem still existed. I think the dammage had been done by then.
    I think there is a half charge in the wiring but not enough to see the lights light up. I say this because the music radio volume can go up and down depending on which accessory electric circut is actuated.
    The manual alludes to a Multi Function Unit (MFU), whatever this is and wherever this is located, all I know is if I went to an Auto Electrician he would have no clue and be a waste of money!

  5. #5
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    Blknight.aus suggested to tap the earth on the roof light. On the third attempt I found this wire and set it in position as it should, however the problem still existed. I think the dammage had been done by then.
    No he didn't. he said the problem may be caused by you earthing the unit via the lights earth circuit.

    Try to find one of the body earth points. There should be one maybe under the seat. Its a stud welded to the body. if not find a bolt somewhere and earth to that.
    Regard sPhilip A

  6. #6
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    Multi Function Unit
    is attached to the back of the fuse block, while your there check the fuses for the interior lights

  7. #7
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    Quote Originally Posted by Ranger 94 View Post
    all I know is if I went to an Auto Electrician he would have no clue and be a waste of money!
    But if you went to one in the first place......

    You've made a change and a fault has appeared, first step is to remove all changes, remove everything you've done, check again for the fault, as pointed out, if you've used supply and earth of the interior light dc will do funny things, the second load in the circuit, cb, will back feed somewhat via the earth

    Now you've disconnected what you've done completely, don't be slack and get supply from the cig lighter atleast

    Schedule of rates

    $40/hr
    $60/hr if you wanna watch
    $80/hr if I'm fixing your work

  8. #8
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    Quote Originally Posted by Ranger 94 View Post
    Thanks guys but the prob seems to be much deeper.

    PhilipA suggetsed to try a new circut for UHF radio. I detached it off the thick brown wire under the glove box and the problem remained the same.
    Blknight.aus suggested to tap the earth on the roof light. On the third attempt I found this wire and set it in position as it should, however the problem still existed. I think the dammage had been done by then.
    I think there is a half charge in the wiring but not enough to see the lights light up. I say this because the music radio volume can go up and down depending on which accessory electric circut is actuated.
    The manual alludes to a Multi Function Unit (MFU), whatever this is and wherever this is located, all I know is if I went to an Auto Electrician he would have no clue and be a waste of money!
    more than likely youve disturbed and lost your primary earth and youre now earthing all the dash electrics through the circuits for the interior lights.

    the dimmer for the interior lights is doing its job and winding the voltages back and your getting a return from that.

    if you dont have the wiring diagrams and cant make sense of what your looking at stop now and go see rovercare offer him the $80/HR. the last auto sparky my workplace hired in billed $1100 for 2 hours worth of work on site.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  9. #9
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    Disco 1 Wiring prob needing urgent help!

    The plot thickens! I removed the UHF totaly and the problem still exists.

    If you open a door, the led display of the radio and clock disappear and no internal curtesy lights or glove box. When you close the door, after a few seconds, led lights only reappear. I turned the internal light on and it glows softly indicating low voltage.

    I ran a direct earth wire off the battery to the internal light with no effect. It appears that opening the doors causes a short which effects several other devices.

    Other than apply a probe to the internal light, nothing has been done to interfer with the circuts.

  10. #10
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    oh this is going to be fun...

    its most likely going to be a fuse or earth.

    first thing

    hook the CB up directly to the battery, make sure it still works and hasnt gone dead short internally (if it IS thats an important clue for later diagnostics)

    then pull each and EVERY fuse one at a time and check it for continuity, Not just with a multimeter get an indicator bulb (12V 18-21W) and make up a test circuit.

    If thats all good start the vehicle, wind the windows down and see if the fault replicates with the engine running.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

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