Normal working
IFEI with battery - ON is totally black (no indication)
If you crank the engine without APU and the throlle is on cutte-off. You see the digit with color black-brown.
During the start.
You turn on the battery
You start the APU
After you crank, on the IFEI you see the digit with color black-brown.
When the engine as started and the generator is online.
The IFEI is coming with the backlight withe. At this time the dim switch, on the IFEI have not impact on the back light.
CAUTION
After the start (or with external power) the IFEI come everytime white is a security ( even if the mode light is on NVG or NITE – if you want change the mode you need to go on DAY and again on NVG or NITE)
Engine RUN or External Power
If you switch the MODE Light on NITE or NVG, the IFEI come Green, and the dim switch on the IFEI is active.
IF you comeback on the DAY with the MODE Light, the IFEI come white and the dim swith is inactive.
I hope is a little better so