The ear pieces are wired in series so if you can hear sound when radio is applied to each then then headset portion works. The microphone + goes to the white wire, The mic - goes to one of the switch contacts in the handset. The other side of this switch goes to the red wire.
The black is common to the headset and another switch contact. Other side of headset goes to green wire and the other side of the switch goes to blue.
The contacts on the snatch plug corrode quit easily so they should be cleaned. Try not to use anything abrasive like sandpaper or steel wool. If still not working you can pull the rubber boot of the rear of the plug to see if any wires are broken.
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