Airmar B744V Junction Box and Insert

(for Raymarine or Navman fishfinders before 2008)

This page describes the older versions of the B744V and B744VL transducers, manufactured before 2008. These versions have a clevis pin through the top of the insert. Also identifiable as B744V-INS-RAY. For B744V transducers used with Raymarine fishfinders.

If your speed sensor is not functioning you should first check that the paddlewheel is intact and turning freely. Damaged paddlewheels can be replaced with a paddlewheel kit.

If the speed function is not working, but the paddlewheel and insert seem intact, then you will need to install an active insert that contains replacement speed and temperature circuitry. You will also need to use an active insert if the temperature sensor has failed. The active inserts have a cable attached and this is to be spliced into the existing transducer cable using the junction box provided. Instructions are included.

If the depth sensor fails, the transducer must be replaced.

Identifying your Transducer

Every Airmar transducer has a label attached to its cable, located near the top of the transducer or where the cable plugs into the back of the instrument or display. This label contains information that is helpful in identifying the transducer and locating the correct service parts for it. For most Airmar products this label will show:

• the model name
• the manufacturing date
• certain performance characteristics (i.e. the transducer's frequency)
• the Airmar part number (PN)
• a Customer Part #

In all cases it is the Airmar Part Number (PN) that is the most important number to have available when ordering parts or contacting us about the transducer.

Before calling or emailing us about parts, please make sure you have the Airmar part number from the label on the transducer cable.