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The relay I was discussing provides power to ctis when de-energized, so it needs to stay or pull it and jumper pin 30-87A. Pullung CB66 will disable its function though...

Well you saw them blackout… The fact they blacked out all by themselves for you indicates to me a bad lights witch…

It should still blackout. Its not as much about night vision as it is about light discipline(You look at that display with NVGs on and they will probably bloom out:)) I think I got my brain around how the circuit is supposed to work. When you select blackout on the light controller it sends...

I cannot remember if it applies or removes power to dim the display. On the A1 K29(blackout relay)controls this using the de-energized contacts. CB66 provides power from the light sw to energize the relay. So with things turned on and the trans and CTIS visible, what happens to those displays...

Since everything was still working, it does sound like the dimmer/blackout circuit went wonky…