SL-Class (R129) 1990-2002: SL 280, SL 300, SL 320, SL 500, SL 600, SL 60 AMG

SL/R129: Flat battery - trickle charge - strange clicking

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Old 07-16-2017, 12:53 PM
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2000 280SL
Flat battery - trickle charge - strange clicking

Wife's 1999 SL 280 R129 battery was flat - eventually managed to open boot & connected CTEK trickle charger to battery. Opened driver's door & alarm sounded - finally managed to turn it off.

However, there's a loud ticking (almost clicking) coming from just in front of engine bulkhead.

Anyone any ideas (sensible please)! Is this natural? Should I worry? Will it stop on removal of charger?



Just taken battery out to charge indoors. Strange thing is the ticking continues!

Last edited by Clive W; 07-16-2017 at 03:17 PM. Reason: More information.

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