the only way to test a duff battery is with a load tester....
a multimeter and voltage aint worth p+ssin on just like vauxfan sez...
I had same problem last year, not long after I got my car. Battery just gave up the ghost overnight. No reason for it, no issues beforehand, just goosed one morning.
New battery cured problem instantly. After trying to charge the old one up overnight, that would only last a few hours before it was dead again.
Like Dailydoggy says, voltmeter tests are no good for testing a battery. Only useful for testing alternator output voltage to charge the battery.
So you can test if your alternator is sending out enough volts to charge the battery, but not how and if the battery holds that charge without a resistance drop test.
Did this get fixed. The bit about the lights coming on without being switched on sounds strange.
Knackered battery is my bet
Change your battery then check the charging voltage and engine earth and engine mounting bracket
I'm having the same thing happen with my wife's 323 though this only happens now and then. It has got more of an issue as it will not start one day then be fine for a couple of days. Today it happened three times. Is this a starter motor or battery.
Tried a jump a while ago but I live on a steep hill so have been bump starting it
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