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Mercedes Sl280 R129 Roof Switch and Roll Bar Illuminated

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Hans Solo5, Dec 1, 2017.

  1. Hans Solo5

    Hans Solo5 Active Member

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    Your Mercedes:
    SL 280 (R129) 1997 Straight 6
    Hi, I stupidly let the battery drop down low, I started her with a battery pack but now the Roof Light is permanently on as is the roll bar light.

    Im praying no permeant damage by using the battery pack, everything else is fine, is it a trip to MB for a STAR plugin and fault clear of is there a DIY fix I could try?

    Is it safe to drive her with the red switches on? the roof switch gets hot !!!

    Best way to keep battery fully charged with causing issues please?

    Thanks in advance

    David
     
    Last edited: Dec 1, 2017
  2. Wighty

    Wighty Senior Member

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    Your Mercedes:
    W211/E320cdi/2009 and CLK200k 2009
    I recently bourght a maypole battery trickle charger for mid £20 from eBay/Amazon ( other sales platforms are available :D) . It allows you to wire the battery in to a pull push connection block that makes permanent trickle charging more easy .
     
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  3. Vintage Racer

    Vintage Racer Senior Member

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    Can't answer the first question, but for the second, buy a C-TEK MXS5

    Not cheap, but I use them on all of my cars and mower etc.

    I have tried cheaper brands, but never get the same performance, or reliability.


    .
     
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  4. John Laidlaw

    John Laidlaw Senior Member

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    Try resetting the roll bar by putting it up and down 3 times. If that doesn’t work I'd disconnect the battery for a short while, reconnect and try the reset again.
    If none of that works then it will need plugged into STAR- hopefully no ECU issue.
    Hope that helps David. Did you have to reset the windows by the way?
     
  5. OP
    Hans Solo5

    Hans Solo5 Active Member

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    Thank you John

    Windows and everything else was fine! How do I reset the roll bar when the switch is not working? is it a case of manually pulling it up and down?

    I read also by pulling the hardtop manually may also work and reseating.

    Many thanks for your help.

    David
     
  6. John Laidlaw

    John Laidlaw Senior Member

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    Ah David the switch isn’t operating then didn’t realise sorry. Hold it in the up position for 10 secs, if that doesn’t work then the battery disconnect for c20 mins and reconnect then if that doesn’t work it needs a Star reset
     
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  7. OP
    Hans Solo5

    Hans Solo5 Active Member

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    John
    My car tech guy suggested to disconnect the Negative terminal only! is this on the same lines as you were thinking?

    I don't need the roof down this time of year but is it safe to drive her with the lights on? roof switch gets very warm.

    Thanks again.

    David
     
  8. John Laidlaw

    John Laidlaw Senior Member

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    Indeed was what I was thinking of....
    I wouldn’t put of getting it seen to if the battery disconnect doesn’t work
     
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  9. OP
    Hans Solo5

    Hans Solo5 Active Member

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    Thanks John
     
  10. LostKiwi

    LostKiwi Senior Member

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    If you have the manual roof latch tool make sure it's all locked down. If so then it should be ok to drive although the roll over bar may not operate.

    The switch will get hot due to the bulb being lit.
     
  11. OP
    Hans Solo5

    Hans Solo5 Active Member

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    Thanks Guys for your responses, very helpful, Im pleased to say by disconnecting the negative side of the battery for 20 minutes, it cleared the lights and everything went back to how it should be ! All working as it should, a word of warning just make sure you have the radio code written down. Very happy with that. Note to-self, get a trickle charger.
     
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