Alarm issue

[Craigj]

Hi my car alarm has started to go off randomly would this be the battery being the issue I measured the voltage it was 12.3v 

[Vauxhall Owners Club]

It could still be the battery supply which could dip and then the battery recovers by the time you have measured the voltage (e.g. warmer air temperature) so I would run a deep discharge test (measure the volts with the engine off and the lights on - should be around 10.8v to 11.5v minimum).

Otherwise, could be water ingress in the electrics so if there are any leaks internally I would start there

[Craigj]

Hi I tried the above it was 11.8v thankyou for you input ,Alarm seems to go off more after its been driven ,I checked the battery volts they read 12.2v .also on the last two times the alarm went off the only way to turn it off was to put key in the ignition and turn the key .

[Vauxhall Owners Club]

More than likely water ingress with the weather we've been having

Is the interior steamed up and lots of condensation?