Out of Warranty-No sonar image on head unit. GPS and Charting all work fine on head unit. Transducer is good when using another head unit. Any other repair facility other than Humminbird at $255?
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I believe it will work without the transducer. This is based upon my locating reports of other Garmin models working without the transducer such as the Garmin echoMAP CHIRP 74sv. Garmin support would likely respond to such an inquiry.
Check you transducer cable route and connections. Look for kinks, punctures, & tears in cable. Visually check the transducer for damage. #2 check the units operation on a friends boat with the same set or research a local marine repair shop to check ops. Best of luck on the problem.
Start at the transducer, mount it then pull the transducer wiring forward using a wire snake. At the same time pull forward 14ga wire to attach to your power leads.
on most boats I've done this process takes from 90 minutes to 3 hours.
The transducer and head unit are easy to put on. Getting wire from point A to point B is the time consuming part.
Once you have your wires pulled forward route them to your head unit at your console. Drilling of access holes may be required.
Connect power, plug in the transducer line.
Black to negative at the battery, red to positive, don't forget to put in the in line fuse included in your box.
If you want to use two head units off of 1 transducer the answer is yes. You will require a transducer switch that allows you to select which head unit receives the sonar signal. If you want to swap head units utilizing the same transducer the answer is also yes you can do that.
Check the mounting location, check the cord connections, make sure the ducer is actually clicking when it is not working, otherwise either the unit or the ducer is going bad
verify cable harness integrity at base connection of transducer , replace cable or check settings easy fix would be change display unit if unit under warranty as replacing transducer is not easy and economical
It is not the transducer. the transducer just provides the sonar reading back to the display. The issue is with the display head unit. Have you tried to adjust the contrast for the fading? Does the screen disappear after awhile? Is the head unit mounted close to other navigation equipment, such as a Compass that may cause interference?
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