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Author Topic:   Garmin Sounder- trouble after rewire
Casco Bay Outrage posted 09-09-2007 02:06 PM ET (US)   Profile for Casco Bay Outrage   Send Email to Casco Bay Outrage  
After several attempts to solve this, I throw up my hands and seek your counsel. I have a whaler gathering on Saturday and want to have this working for a shallow river navigation.

I have a 3 yr. old GSD 20 sounder and Garmin 176c GPS on my Outrage 17. Both worked great. Last year I rewired the boat and disconnected both units.

The sounder is a black box inside the console with two connections, a transducer cable with connector and a second cable that goes to power and splices into a GPS power/data cable going into the GPS.

On reconnecting everything, the GPS works fine but I can't get the sounder "box" to power up/display. I used to see the LED light illuminated on the sounder "box" when power was turned on. Now there is no light and no display on the gps.

Both units have their positive and negative wires on the same positve/negative terminals of the fuse block. Each has a separate in-line fuse.

I am using the Garmin manual and followed the wiring diagram. I searched Garmin's support website, no help.

I replaced the sounder power cord thinking it was the connector. No change.

I am using marine grade wire,connectors, fuses. I have
made new connections, changed fuses with no luck.

Does anyone know what conditions result in the LED light on the sounder "box" to illuminate.

Should it work if connected to power only and not to the GPS.

How can I troubleshoot to determine if the problem is the sounder "box" or the transducer.

Is there a test to identify if it is the sounder or the transducer?



Bella con23 posted 09-09-2007 11:01 PM ET (US)     Profile for Bella con23  Send Email to Bella con23     
I wish I could offer you some repair advise, but it sounds as if you covered the obvious. The unit will still work with or without the transducer. I don't have my transducer connected to my 178c because I use a separate sounder unit.
You can send it in for repairs, but it may pay to replace it at this point.
6992WHALER posted 09-10-2007 09:24 AM ET (US)     Profile for 6992WHALER  Send Email to 6992WHALER     
When I had my black box installed 3 years ago. I went through the same thing.
My mechanic installed it. When I water tested the unit it did not work.

My buddy and I went through all the wires and it all looked correct.

I gave it back to my mechanic. He went through it, and found one wire connected to the wrong location. I don’t remember if the installation manual was wrong or if we all saw the colors different than Garmin did.

I would call Garmin and make sure you are interpreting the wire colors correctly.

Good luck

Bella con23 posted 09-10-2007 03:51 PM ET (US)     Profile for Bella con23  Send Email to Bella con23     
I did a little investigating on Garmin's website and found a troubleshooting PDF for the newer model -

Solid Red (no blink) –
Software failure – Call Garmin Product Support. If the cause is a software error, the display unit can show the error. Power must be cycled to clear the error.

I don't know if it pertains to your unit as well, but it is a start.

I also found a repair section on Garmin's site. For your unit the price is $70 including any newer software updates.

Casco Bay Outrage posted 09-10-2007 07:15 PM ET (US)     Profile for Casco Bay Outrage  Send Email to Casco Bay Outrage     
Joe -

Thanks for the research.

There are a few wires that are not used from the sounder so I will try a little testing to see if it is a color match/misprint issue. It is raining today so I will try tomorrow.

I noticed today that I can call Support and after thinking about these replies. If I strike out tomorrow, it can't hurt to call.

I actually don't get any light/blink at all. Hmm....

The newer model sounder (GSD 21) costs approximately $250. Ouch!. I only use this for depth. That's a pretty expensive depth finder.

Thanks for the help


Bella con23 posted 09-10-2007 07:57 PM ET (US)     Profile for Bella con23  Send Email to Bella con23     

Good luck!
I'd like to hear the outcome.

Casco Bay Outrage posted 09-11-2007 03:48 PM ET (US)     Profile for Casco Bay Outrage  Send Email to Casco Bay Outrage     
Joe -

This is the guide I used. Even went to the web to make sure my copy (came with the boat in 2005) was still accurate.

It is POURING here.

Will let you know.


Casco Bay Outrage posted 09-13-2007 06:59 PM ET (US)     Profile for Casco Bay Outrage  Send Email to Casco Bay Outrage     
Finally got time to call Garmin.

Man, they are very helpful. No long wait, pleasant staff who know stuff.

Bottom line....wiring diagram is WRONG. Great news for me.

I think they are thinking that I am a nut for being so happy their wiring diagram is wrong.

Go figure.


Bella con23 posted 09-13-2007 08:05 PM ET (US)     Profile for Bella con23  Send Email to Bella con23     
That IS good news. I hope it fires right up for you. Let us know what the change is so we can us it as a reference.
Casco Bay Outrage posted 09-14-2007 09:01 AM ET (US)     Profile for Casco Bay Outrage  Send Email to Casco Bay Outrage     
For the 172c (now discontinued) and the GSD 20 (also discontinued) there are orange wires for remote powering on/off. This feature is not supported on the 172.

The wiring diagram shows them either wired together or unattached.

The CORRECT wiring is for the GSD 20 orange wire to go to GROUND. The 172c orange wire is not connected to anything.

Never would have guessed that.


newt posted 09-14-2007 09:12 AM ET (US)     Profile for newt  Send Email to newt     
Great news! Phil is now the official sand-bar-finding lead boat for our shallow river trip tomorrow! Glad to see you got the problem sorted out.

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