High pitched whine and flat battery

Rudder · 30th October 2013, 17:50

I had my suspicions about the satnav unit not shutting down...how can I tell, and if it is, how do I sort it?

I bought a new battery and put it on the car, started it and everything is spot on. Checked across the batter when engine is off and its reading ~12.3v and while the engine is running its reading 14.2v. I turned the heater on, rear heated window, both heated seats, lights and checked it...14.03v.

However, when I turned the car off and checked the voltage, it was slowly dropping from around 12.30v to about 12.20v and sort of hovered around that. I don't want to leave the new battery one all night incase it gets drained, so i've put the original battery one and its starting reading was 9.03v, i'll check it in the morning and see if that has dropped any more.

30th October 2013, 17:50	#20
Rudder Regular poster Rover 75 Tourer 1.8T Join Date: Jan 2013 Location: Chichester Posts: 60 Thanks: 0 Thanked 0 Times in 0 Posts	I had my suspicions about the satnav unit not shutting down...how can I tell, and if it is, how do I sort it? I bought a new battery and put it on the car, started it and everything is spot on. Checked across the batter when engine is off and its reading ~12.3v and while the engine is running its reading 14.2v. I turned the heater on, rear heated window, both heated seats, lights and checked it...14.03v. However, when I turned the car off and checked the voltage, it was slowly dropping from around 12.30v to about 12.20v and sort of hovered around that. I don't want to leave the new battery one all night incase it gets drained, so i've put the original battery one and its starting reading was 9.03v, i'll check it in the morning and see if that has dropped any more.