Hi all,

This is my first post so I hope you are all well?

I have a MK3 Focus (2011) 49000 miles that's been doing a lot less mileage these days due to working from home etc. To ensure that I maintain the car I've been driving it once a week and checking the battery voltage periodically. With the bonnet left up, in the garage, I've notice that there’s a parasitic drain which is dropping on average about 0.3V per day from a fully charge battery.

I've run all the normal tests with a multi-meter. If I remove the sensor connected to the bonnet lock there's no further voltage drop. I've tested this over a 2 day period and the battery has maintained as steady 12.75V which is good news.

Is the issue I'm seeing normal or does this indicate an issue with the connection/sensor connected to the bonnet lock? I can leave the sensor disconnected when I'm not driving the car but I'm concerned that leaving the car outside for an extended period could drain the battery. Are they any tests I can do on the sensor itself?

Best regards,
Phil