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Thread: rear light brightness not identical

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    Regular Member chewy71's Avatar
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    Default rear light brightness not identical

    My drivers side rear lights appear to be dimmer than the passenger side. Other than possibly the light unit being an aftermarket (i.e. not a genuine VX part), is there any other reason tht would cause the lights (all brake, tail and reverse) to be dimmer?

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    Regular Member Critch's Avatar
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    High resistance in the earth for the light somewhere

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    Regular Member chewy71's Avatar
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    Quote Originally Posted by Critch View Post
    High resistance in the earth for the light somewhere
    easy to determine /fix?

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    Regular Member DAVIDD88's Avatar
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    diffrent bulbs

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    Regular Member chewy71's Avatar
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    Quote Originally Posted by DAVIDD88 View Post
    diffrent bulbs
    just fitted all new bulbs to the tail lights and no difference

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    Regular Member TonyP2020's Avatar
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    Quote Originally Posted by Critch View Post
    High resistance in the earth for the light somewhere
    As Critch said.
    One way to check is to put the drivers side indicators on and see if any other bulbs glow dimly, at both the front and rear of the car.
    Then get someone to put the brake lights on and look again for bulbs glowing dimly front and back.
    You might have to do this after dark, whilst covering the lit bulb with a cloth.

    Another thing to check is for a brown wire, with a round connector on it, that might be floating loose near one of the rear lights.
    On my old 53 plate DTi, this loose wire was on the passenger side, but I think I recall another post somewhere on here saying the wire was on the drivers side.
    It needs to be under one of the 3 nuts on the fixings for the rear lights.

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    Regular Member Critch's Avatar
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    you will need to volt drop check to find it
    start with checks above then. Then multi meter time.

    Another quick way Is to use a piece of known good wire place on earth side of bulb or even to earth on light unit (theirs small chance that problem lies on tracks inside the light but I doubt without noticing other problems the fault lies their) to good earth see if it brightens up.

    you will then need a multimeter to check earths. Should be zero voltage after bulb in an ideal world.
    but about .2v would be acceptable amount.
    More means theirs resistance in that earth.

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    Regular Member chewy71's Avatar
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    thanks chaps,.. will carry out the above.

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    Hi dude - did you find out what caused it and get it fixed? I'm having a very similar problem but mine is not the whole light cluster but just the tail lights on the driver side, definately dimmer than the ones on the passenger side. All other lights are fine (indicator, reverse, brake and fog). I tried swapping the bulbs over with the passenger side ones (tail light bulbs) and the dim ones from the driver side brightened up to normal luminesance and the ones from the passenger side we're only dimmly lit. Not sure how to check the earth (i'm gussing it's not a fuse or relay as I'd have no light at all then!). My beloved is a 55 plate Vectra C, 1.9CDTi (150) SRi and I love it to bits!

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    I've got the same problem on my drivers side rear. The problem is caused by the top pin on the light cluster being corroded. The black connector is also a bit corroded. The lights get brighter if I clean it up and wriggle the connector a bit but they need to be replaced.
    Any idea of the part numbers of the drivers side holder and the black connector?
    Thanks

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