Power supply in volvo fh

Moved into another unit yesterday, got two extra power plugs on the passenger side but they aren’t labelled more then ‘max 20a’ on them does anyone know if they’ll be 12 or 24 v please?
Got two on the centre of dash 12v labelled on the left and no label on right so can assume it’s 24v as it’s same as my last unit although opposite way round.
Only reason I need to know is my fridge is 12v so want to make sure it’s in the right socket.

On mine the farthest left is 24v and the next is 12v.

Thanks but these two extra ones are vertical and in the passenger footwell.
My other two are same as that I re-check yesterday.

opps.

Make sure as I blew mine up doing exactly what you describe.

Had them tested earlier the top one is 12 bottom 24 fridge won’t blow(hopefully).

I had this problem over the weekend. Wanted to feed cb. My FH has 3 in the centre of dash. The ■■■ lighter is defo 24 volts so just tried the 3 sockets. It wouldn’t work in 1 so took that as 12 v. (CB for abnormal work)