When I start the 744x with cold and dark and turn on the battery only the left ground power light comes on, and it is operative. If I click the right one nothing happens. They both come on in the freighter version. I have uninstalled and reinstalled the program several times but the result is always the same. Can this be corrected?Art StuartKABQ

So you're saying the other AVAIL light didn't come on?External power supplies are programmed to be random in PMDG. You won't get both Ext Power supplies all the time.Sorry, but I wished you'd asked us before wasting your time reinstalling :(Actually, this topic has come up before on the forum. Maybe you could try a quick search next time you have a problem ;)Cheers.Q>