transponder wire disconnect

transponder wire disconnect

I have a King kt78tso which was working prior to nav/coms replacement. the transponder is illuminated but non fuctional to radar. I traced the wiring harness out of the transponder and found an "unattached wire" labled "phono out". I am not certain of how this relates (if at all) to the output of my transponder, but its the only visable disconnection.  does anyone have any thoughts on this or had a similar non fuctional transponder?  Thank you for your responses in advance.....

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Re: transponder wire disconnect

...problem solved. The avionicsman mis-labled the wiring... I tracked the pin-outs and found the disconnect.

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