You are probably going to need at the very least a passenger type controller or fader to keep it all at your end. BTW is this for your GL1200 or another Wing?
...had a girlfriend or two that HATED my radio equipment - competed against the stuff. Couldn't stand hearing it..I DON'T WANT TO ADD IT TO MY PASSENGER CIRCUIT
My thinking is using the same mic..... wired to the on board CB and the 2m radio with separate ptt for each radioThe only way to do it as you stated is to run second mic and PTT
Thanks.. After I get through with 4-wheeled problems I'll look into this alot more..I'm not sure if you've read/seen this - but this has worked for a few similar installations. http://www.marc-hq.org/40.technotes/40-40.r1993-12.r01p01.htm
In reading the OP, this may not meet your exact need of isolationg the passenger from teh solution since this integrates with the common-channel audio system. Details in the link are for the 1500, but the solution will behave nicely in your 1200's factory intercomm as well.