MGL Avionics User Forum

That was my problem and it's now solved. Rdac grounding was a problem. I added a wire from the engine bolt where Rdac was grounded to firewall common ground and now Rdac works perfectly.

I just checked the whole system and both SP6 and SP7 are douple flashing, RDAC single flash. I also checked wires and connectors and they are ok. Few days ago I updated the EFIS, is there anything else I can do?

I have just installed EFIS LITE with RDAC-XF, SP6 and SP7. 120 ohm resistors are installed in SP6 in fuselage aft of cockpit and in EFIS LITE. Now EFIS reports that "Rdac is not available". Green light in Rdac is flashing 1Hz. Should I install 120 ohm resistor to Rdac or what is your advise?