I managed to power the aircraft from a 100 amps external power source, with no change. When they overlap, only the wingtip strobes work. However, as soon as I press the avionics button to start all the equipment, something strange is happening. Somehow, the 2 strobes magically always stay out of sync and flash one after the other, with no more issues. I did the test several times. Avionics on, strobes always flash one after the other and work with no issues. Avionics off, the strobes timing starts to shift and, as soon as they overlap, the tail one is not flashing. Avionics on again, magically they somehow sync and flash only one after the other, no issues.This is driving me crazy! The 2 strobe systems have no sync connection and do not communicate in any way. How on earth starting the avionics will always get them to flash one after the other?The only thing that happens when I start avionics is a higher overall load on the battery, which should make things even worse...I don't mind the current setup, since I always fly with avionics on, however I don't have any idea what happens, if any of you do, please let me know!