Good afternoon EL39,
Thank you for your inquiry.
Can you please provide more information on how you wired the transducer to the 10 pin plug. What are your current wire pin-outs. Do you know if the GSD24 is a diplexed sounder module?
The TZT2 sounders require a diplexed transducer. If there is no internal diplexer in the transducer then it will need to be wired into a MB1100 matching box.
Could you also please provide some photos of the sounder in operation to get a better understanding of what you are looking at?
Look forward to your replies.
Kind Regards,
C-Bass