Instruments Lights Problem on 744 and 744F

[Guest dtruittjr]

Whenever I load up either the passenger or the freighter version of the 744, both the Overhead Panel Lights(OPL)and the Glareshield Panel Flood Lights (GPFL)work as expected. However, as I taxi, both the OPLs and GPFLs go out, and I cannot get them to illuminate again. The switches look and sound like they are operating normally.I try to turn them on and off, but to no avail. I noticed this problem appeared shortly after I installed the sound upgrade. Any suggestions?-Donald

[Guest pilotbrian0]

what is the light situation outside?What about the power situation (I'm assuming you have enough power as you are taxiing).Did you try hitting L a couple times, see what that does? There are a few options, I'd try them and see what happens.-Brian

[Guest glide]

sounds like your engine driven generators are not connected and as you release the park brake (and ground power) to taxi and the result is your power supply is disconected,fynn