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Shine another light

Discussion in 'Defender 90 / 110 / 130' started by Mackers, Nov 12, 2019.

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  1. Mackers

    Mackers Well-Known Member

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    I did create a thread last week but no one's answered my update so you might have been able to see it?

    I'm missing something still. My brake lights work on their own. When I put the side lights on and press the brake pedal, the reversing light comes on and the side lights and brake lights go off. I've moved the earth for the one faulty side light and reversing lamp to a different earthing point (which is a good earth). What's going wrong?
     
  2. Europa486

    Europa486 Well-Known Member

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    Usually it’s a bad earth so run a separate good earth to make sure it’s not that,
    Then check bulb holders and the bulbs them selves,
    Work back from the rear lights along the loom checking any multi block connections,
     
    Turboman likes this.
  3. kermit_rr

    kermit_rr Can't Really Re-Member Full Member

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    Almost certainly earthing
     
  4. swisstoe

    swisstoe Well-Known Member

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    You've got Christmas tree lights up already ???
     
  5. mystery

    mystery Well-Known Member

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    what year and model
     
  6. Disco1BFG

    Disco1BFG Well-Known Member Full Member

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    As I said in your other fred:- ( I was agreeing with @mick the builder BTW )

    So, It's a bad earth - jury rig a "new" temporary one with cable outside the vehicle to the light fitting in question, and keep testing.... when the problem goes away .... you've found the problem, and you'll have your answer :)
     
    mick the builder likes this.
  7. zeaphod

    zeaphod Well-Known Member

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    There should be an earthing point at the rear offside of the tub. Give it all a good clean - and run a temporary earth from the battery to it to test if it is causing the faults. There should be an earth connection back from all the lights to it.
     
  8. Interceptorxj

    Interceptorxj Well-Known Member Full Member

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    Check the earth connection in the bulb holder and the actual condition of the bulb holders too not just where it earths to the body.
     
  9. Mackers

    Mackers Well-Known Member

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    I thought it was bulb holders so I've bought new side lights. I'll try all of the above and thanx y'all
     
  10. mick the builder

    mick the builder Well-Known Member

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    So are you absolutely sure what needs to be done now?
     
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  11. mick the builder

    mick the builder Well-Known Member

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  12. Mackers

    Mackers Well-Known Member

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    I am, it's just that it only started happening when my bulb melted in the side light, I put two new ones on, all the connectors are fine and unchanged and tight, and I sanded and cleaned the earth. I had a few days where everything was OK, but now it's back to square one. But there's new things to try now :0)
     
  13. Mackers

    Mackers Well-Known Member

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    Just wondering, why would the reverse light come on instead of the brake light when they're wired separately? I've made sure that both the new rear lamp and the reverse light are very well earthed to the chassis.
     
  14. Disco1BFG

    Disco1BFG Well-Known Member Full Member

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    Disco1BFG said:
    it's always a bad earth - either cos the thing has gone completely open circuit - or like in this case where one circuit has lost its designed / designated earth return, and is therefore "forced" to use another circuit for the return...

    I.E. - the brake light earth is missing/bust/fecked/etc.! , so it is earthing through the reversing light
     
    300bhp/ton likes this.
  15. Mackers

    Mackers Well-Known Member

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    Wrong. I put a new lamp unit in. When it was mentioned on here that it was the earth, I took the earth out of the triple bullet connector which earths the side light and reversing lamp and another AND EARTHED THE NEW PRE-wIRED LAMP UNIT TO THE CHASSIS ON IT'S OWN. I still have the same problem, which is: Brake light out, reversing light ON when I press the brake pedal. So, I have also removed the reversing lamp earth from the bullet and earthed it to the chassis earth point. My thought, could the live from the reversing lamp be earthing to the chassis?
     
  16. Disco1BFG

    Disco1BFG Well-Known Member Full Member

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    NOT wrong at all - now you explain it as above - it seems you have wired the reversing light to the brake light circuit o_O
     
  17. Hippo

    Hippo Lord Hippo

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    Did these faults only happen after the melted bits problem? Could you have crossed the wires over? Or do the nee units need wired differently?
     
  18. Mackers

    Mackers Well-Known Member

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    I
    Gonna try wires. I get wires crossed all the time :0(
     
  19. 300bhp/ton

    300bhp/ton Well-Known Member

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    +1 to it being a dodgy earth of some kind. The wiring is pretty simple, just work through it with a circuit tester on each circuit until you find the issue. Clearly something is becoming live when it shouldn’t.
     
  20. Mackers

    Mackers Well-Known Member

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    Seriously this is turning into one mother F#@king nightmare. Reverse light going out with brake light. I want to die! Any diagrams or sugg 20191116_122326.jpg estions?
     
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