Battery Charging - Alfa Romeo Forum
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Battery Charging

OK this isn't for my Alfa, but I thought someone might know. The battery in my wife's c class is dead (5.7V). I couldn't unarm the alarm and now the alarm is periodically going off with the back up battery for the siren. If I disconnect the battery, the alarm goes off continually. Can I hook up a charger onto the battery purely to unarm the alarm system or will this fry anything? I'm not talking about starting the engine. If I don't get it unarmed, it will go off all night I reckon, and i suspect the neighbours will want there christmas cards back. Anyone know?
Alan
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(Post Link) post #2 of 3 Old 30-12-09 Thread Starter
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'04 156 GTA

Done it, only 9.5V from charger, allowed me to unarm the alarm system.
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Depends on the charger. I've done it with a basic charger, but it goes haywire with a conditioning charger like the CTEKs. I've also done it with jump leads from another car, and indeed from a spare (old!) battery I have in the garage.
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