Can Only Power Up 1 of 2 EFIS Screens

mikemalone

I love flying!
Joined
May 12, 2017
Messages
36
I am installing 2 x HDX1100 Displays.  The first time I powered up the system from the aircraft Battery via a VPX Sport, only the left screen powers up.  Both displays power up when my one Dynon standby battery is connected to the dead display.  Further trouble shooting shows that the opposite happens when I swap the display harnesses over, in that only the right screen powers up.  This might lead me to believe that the problem lies in the harness for the right display.  However, I've used a multi-meter on the right display to test both power pins (D37-1&20) and both ground pins (D37-21&22) which show good continuity.  Am I missing something else obvious?  Thanks.
 
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