Furuno and Airmar claim you may cut to shorten transducer cables but to do it away from the connectors using a junction box from Gem Electronics:
<b>Can I cut my transducer cable?
Yes, the transducer cable can be cut. However, if the transducer came with a connector do not cut it off. The molded on connector is waterproof. You need to cut and splice the cable away from the connector using Airmar's splash-proof Junction Box. The connections will not corrode and the strain relief grommets are water resistant and have excellent cable retention. Please note that cutting the cable or removing the connector, except when using Airmar's junction box, will void the sensors warranty. You can buy a junction box and splice kit for our distributor Gem Electronics.
Gem Electronics
Phone: 843-394-3565 Fax: 843-394-3736.
Note: Carefully follow the instructions provided with your junction box.
***If you have a TRIDUCER multi-sensor, the ceramic element inside builds up a charge. When the cable is cut, it can discharge possible disabling the speed sensor.
</b>Probably worth a phone call...