Hi Volks,

The hella p/n is 4RA-003-LGE-141  for a kit.  includes wiring, fused relay.
The original has a diode in it and is not the standard cube relay.  The
diode is part of the alternator sensing circuit that disconnects the fridge
when the alternator is not charging the battery.  The hella unit does not
have the diode and relies on selecting a signal that is not 12VDC when the
ignition is off.  You could choose the drive for the alternator indicator or
just the ignition in "run" not "accessory" mode.

pensioner