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Thread: electrical fault 94 TDI trayback

  1. 17th September 2019, 04:36 PM #1
    dromader driver
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    electrical fault 94 TDI trayback

    Chasing an electrical fault and the wiring diagram doesn't help much.

    symptom. if engine not running no headlights. also blowing the 30 amp link fuse.

    Is there some sort of voltage regulator as have had same experience with failing alternator however this one is generating about 13.9 volts. Where is it located and what does it look like. Vehicle is also fitted with a turbo timer but no impact on that circuit.

    The wiring diagram I have doesn't even show the big link fuses. yes the wiring is old and stiff but no obvious shorts present.

    Any comments or observations welcomed. No lucas smoke present at the moment.
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  2. 17th September 2019, 05:23 PM #2
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    roverrescue
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    My guess;

    Dodgy headlight switch with combo of dodgy earthing of behind dash wiring


    Gonna be a bear to chase unfortunately

    Luckily the lighting circuit it pretty dumb n stupid !
    Ign Power supply from fuse to column switch to lights
    Lights are earthed at front radiator support panel from memory and column switch earthed to earth point in the rats nest behind instrument cluster

    S
    '95 130 dual cab fender (gone to a better universe)
    '10 130 dual cab fender (getting to know it's neurons)
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  3. 17th September 2019, 05:40 PM #3
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    Blknight.aus
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    easy to chase,

    put a spare headlight bulb on a set of spade connectors plug it in where the fuse lives, when its bright you have a short, if its off you have a break if its dull the circuit is probably working, put your meter on in series with the lamp, check the amps drawn make about sense and then replace with a fuse.
    Dave

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  4. 17th September 2019, 07:43 PM #4
    dromader driver
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    Quote Originally Posted by Blknight.aus View Post
    easy to chase,

    put a spare headlight bulb on a set of spade connectors plug it in where the fuse lives, when its bright you have a short, if its off you have a break if its dull the circuit is probably working, put your meter on in series with the lamp, check the amps drawn make about sense and then replace with a fuse.
    Thanks will try tomorrow
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  5. 18th September 2019, 12:41 AM #5
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    incisor
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    my 95 130 had issues with the rear of the fuse block

    had to remove the block to see that it was melted at the back where the inserts were..

    everything looked fine from the front but had the same issue as you

    obviously a previous owner had big lights running off the std setup

    fitted new switch, and a traxide headlight and spotlight relay setup and sorted it all
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  6. 18th September 2019, 08:51 AM #6
    dromader driver
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    Quote Originally Posted by incisor View Post
    my 95 130 had issues with the rear of the fuse block

    had to remove the block to see that it was melted at the back where the inserts were..

    everything looked fine from the front but had the same issue as you

    obviously a previous owner had big lights running off the std setup

    fitted new switch, and a traxide headlight and spotlight relay setup and sorted it all
    Thanks, will inspect that area again
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