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It's possible that the speaker output will only get cut when a specific voltage/resistance is encountered across some of the pins.
The Motorola Sabers are like this, the functions of the radio that are switched between external/internal are regulated by the resultant voltage after the signal passes through the accessories.
In many cases I've had to throw a resistor in to get the accessories to work properly. There's different resultant voltages for ext mic+internal speaker, ext mic+ext speaker, ext mic/speaker + ext antenna, etc.
Not sure this is the case with these radios specifically but that's what the problem Eagle and cecio are talking about appear to be at first glance.
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