Battery Alternator Warning - Mercedes Benz SLK Forum

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#1 Old 4 Weeks Ago
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Battery Alternator Warning

I have a new battery - purchased Nov 2018 - still under warranty. Since January the car has been garaged and on a CTEK charger.

I started it up a few days ago and got the battery/alternator warning. I took it for a 60MPH drive - didn't help.

I then connected the CTEK up again and left it overnight. The charger says that the battery is able to hold charge.

I haven't turned the engine on since disconnecting the CTEK. A few hours after disconnecting the CTEK the alarm started going off randomly. The only way to make it stop was to unlock the car and disconnect the battery.

The next morning the disconnected battery is providing 13.1V and if I connect it it is at 12.9V.

I initially assumed because the CTEK says the battery can hold charge it must be the alternator or voltage regulator, but then why after fully charging did the alarm go off? That makes me think the battery is draining too low and freaking the car out and therefore the battery needs replacing.

Any ideas what do do/try next?

Thanks!
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#2 Old 4 Weeks Ago
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could be your alarm battery and not the car battery
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#3 Old 4 Weeks Ago
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Need a new siren alarm.
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#4 Old 4 Weeks Ago
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Great, thanks! I will get a new one and get back to enjoying this weather.
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#5 Old 4 Weeks Ago
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Id test what the alternator / battery is kicking out voltage wise on load and off etc
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