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Hi Roger,
The ST4 port is quite simple you have 4 directional pins plus a ground pin.
These are the pin-outs for a RJ12 plug (front view) on an EQ6.
pin 1 is NC
pin 2 is GND
pin 3 is +RA
pin 4 is +DEC
pin 5 is -DEC
pin 6 is -RA
All you need to do, is short GND to one of the directional pins to drive the motor (usually a narrow milli-sec pulse from the guide cam).
If your ME thinks it is being guided in all directions, that would probably mean that those 4 directional pins are somehow shorted out to GND inside the ME. So a dummy plug would not help.
With the mount switched off you could use an ohmmeter to measure the resistance from those directional pins to GND and verify if they are shorted out. If it is, try and trace back from there on the ME PCB board. Could be a faulty optocoupler.
Cheers
Bill
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