Daf cf 85 12 volt supply

Hi all my 24 volt to 12 volt dropper has died so before I have to shell out some more hard earned readies
Does anyone know how to pick up a 12 volt supply in cab without going all the way to battery please :question:
Ps 2002 vintage :unamused:

i have a household plug socket in the cab directley off the battery but remember to join the wire so it can be split if you tilt the cab