I'm trying to use a portable push-to-talk switch as a co-pilot PTT w/ my
built-in intercom. The Portable PTT accepts a male mic connector and has
it's own male connector that is inserted into the female mic connecter in
the intercom.

When these connections are made, the PTT function works properly, but the
co-pilots mic isn't transmitted to the other intercom participants for
normal (non-radio) communications.

I have access to all the connections of the female mic jack on the PTT
switch. Does anyone know how to re-wire it so that the mic is still in
the
intercom circuit?

Thanks in advance!

Portable PTTs come in two flavors: the kind that pass audio through all the
time, and the kind that only pass audio through when the radio key is
pushed. You need the kind where the audio can get through all the time.
Sigtronics has them, part number PTT-HS. Work good, last long time.

You can test yours with an ohmmeter just to be sure. Mic Audio is on the
middle conductor, sometimes called the Ring by the Old Farts.