Century IIB Radio Coupler

[flybylatham]

So I still have my Century IIB with a Garmin 480 and GI-106 wired to the radio coupler. The HDG select function works, but my NAV, OMNI, and LOC won’t track a course in either GPS or VLOC. It seems like it tracks for a moment but then it starts drifting to the left. Had a shop trouble shoot it, said that it might be the radio coupler so I sent it out to Autopilots Central and had it repaired. Put it back in and it still has the same issue. I dismissed the main autopilot controller since the roll and HDG function still works as advertised. Was wondering if anyone has any thoughts? Do I need to do the whole calibration process and push that red button on the back of the coupler?

Chris

[bradp]

Any recent work on the panel? You can ping  out your interconnects between your navigator and radio coupler as a first step 

 

How about heading mode? Is it just Nav/omni or localizer mode as well? 

[N201MKTurbo]

There are two wires +right and +left.. if your +right was disconnected it would only correct to the left. I would check the wiring on those signals.