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juswalk
1st Mate

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USA
34 Posts
Initially Posted - 05/22/2013 :  05:26:05  Show Profile
Good morning,

I have a strange issue with the Hummingbird 383c GPS/ Fish finder combo:

All power on and shore power connected= GPS displays a message stating "Transducer not connected" and reads depth and position erroneously.

Remove shore power= Same issue

Start the motor with shore power removed= GPS finds itself and depth is spot on.

Shut motor off and leave shore power disconnected= GPS and depth remain accurate until the GPS power is cycled.

The transducer cable runs is close proximity to the powered distribution panel so maybe relocating will help.

I understand interference can occur with motors running but this is the opposite, the running motor seem to fix the problem and once started the problem is gone until the GPS is shutdown and restarted.

Thoughts?
Hull#5484 1986 Catalina 25 TR/FK "Lorelei" NAS Pensacola
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Stinkpotter
Master Marine Consultant

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Djibouti
9076 Posts
Response Posted - 05/22/2013 :  07:30:02  Show Profile
I'd check the battery voltage for each of those conditions. Maybe it's something like too high with shore power connected, too low with it disconnected, but within range with the engine running.
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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts
Response Posted - 05/22/2013 :  08:15:03  Show Profile
Along the same line as Dave mentioned it sounds like the engine is providing a stabilizing voltage. Make sure you check the power connections to the finder for any corroded or loose cables all of the way back to the battery. Variations in electronic output is often traced to a bad ground connection.
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juswalk
1st Mate

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USA
34 Posts
Response Posted - 05/22/2013 :  14:34:46  Show Profile
Excellent advice. I'll check that this weekend. Thanks!
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rrick
Captain

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USA
261 Posts
Response Posted - 05/22/2013 :  18:16:29  Show Profile
Yacht electronics are increasingly coming equipped with internal voltage regulators. Your model accepts 10-20 VDC. A brand new open array radar system no longer requires an external 24 VDC step-up/ regulator/ conditioner, but now accepts 10.8 to 32 VDC; even the radome models accept 12-24 VDC.


You need to check check your crimps and wire conditions. A running engine or charger gives your DC system about 13.6 volts. As the Hummingbird draws current through a poor connection, the voltage drops at the connection but just may remain over 10 V. On a fully charged battery, 12.7 VDC, the Hummingbird just may draw enough current through the corroded or poorly crimped connections to drop voltage below 10 VDC causing shutdowns.

Simple multimeter voltage testing at the Hummingbird connector is not enough; it will read 12.7 on battery or 13.6 on engine/charger. You need to load the Hummingbird circuit connectors with an extra cabin light or other 12 V device, then read the voltage.
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juswalk
1st Mate

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USA
34 Posts
Response Posted - 05/23/2013 :  05:11:04  Show Profile
I will try that as well. Thank you very much
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.