Are those figures right Phil- is it to do with the diesel glow plugs? It must surely time out as your battery won't like 68 Amps being drawn for long with the engine not running.Ignition on, current out of battery, peaks at 145 amps for about 2 seconds and then drops to 68 amps. This current remains while ever engine is not started. Battery volts 11.3V.
According to ForScan I get just over 10 Amps drawn in similar conditions (entertainment and HVAC turned off.)