Merry Christmas Markoz! 
First step without the tanks: All tanks fill except the ext. tanks
Second step with the ext. tanks: All tanks fill except the ext. tanks
After this I using the ALT > Aircraft > Fuel and Payload and set ext.1 and ext.2 to 100.
Ext.2 has 100 and hold it
Ext.1 has 100 and fall fast (1-2 seconds) to 0

Greetings

How can I fix it?

Since it is not possible for me to start a new topic I will add it here:

Has anyone notice that the low fuel lights doesn't light? It does not matter how less fuel is in the (e.g. ext) tank - the light does not come up!

Is there a possibility to repair this?

Steffen wrote on Jan 3^rd, 2015 at 10:39am:

The GPS is also off then, right? Have had the same problem. This is not a bug, but this has to do with the to Power-Switches "Copilot AC Instrument Switch" and "AC Instrument and Engine Switch". First one have to be in position "Essential AC Bus", Second to "Essential DC Bus".

Reset both Switches first after loading the flight for prober initilalization. After this all shoud be working as it should 

Ok, simply turn it shortly to "off", that should be enough 

In addition I would suggest to turn always the "Nacelle preheat" switches to "on" - this avoid problems with freezing systems.

short feedback.
Flight EDDW-EDDC without freezing.
But I observe an calibration error
ILS Approach on RWY 22 at EDDC
ILS frequ 109,7 direction 219
but  HSI and course selector at 219 course deviation shows 222
I put my airplain ant the beginning of RWY 22, the compass card shows 222 too

Thanks
But bck to my previous problem
>>>After Engine start or during flight suddenly the Radio panel and Autopilot panel shuts down.
It is not possible to tune VHF, VNAV and ADF in the radio panel and not possible to power on the autopilot panel>>>>

Ok, simply turn it shortly to "off", that should be enough  Smiley

>>>In addition I would suggest to turn always the "Nacelle preheat" switches to "on" - this avoid problems with freezing systems. <<<<

done, one flight without problems but flight just EDDK-EDDV freezing NAV, VOR and Autopilot suddenly during taxi.
Sorry, but if this problem not solved I am not willing to use C-130 again. abslolut frustration

freezed are only the digital vealue input of VOR and VHF and the activation knop of autopilot
Pitot heat, engine inlet air duct antiicing, propeller ice control, antiice empenage, wing antiice are always active.
As said before the freezing problem occurs at the ground and during flight without systematics. I fly only in 2D-mode to have a better look an the different panels.