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Basically, Can I use the GPIO pins to short/join to wires together then disconnect.

For my radio I have a PTT wire which needs to be grounded on the ground wire to key up.

Do I need a breakoutboard? What GPIO pins can I use?

There is no electrical current on these wires at all.. its just joining two wires together via gpio using a script

Thanks Sonic

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Basically No.

There must be some "current" on the wires or it would not work.

Connecting GPIO to an unknown foreign circuit risks damaging the Pi and/or the other device.

You could try using a FET as in http://elinux.org/RPi_GPIO_Interface_Circuits but the only safe method is to use a relay or optoisolator.

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