Question about Garmin GPSMAP 178C Sounder GPS Receiver

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Garmin 178C Stays on for 20 secs then turns off

Had the same problem. Cleaned the connector which I thought fixed the problem. That was last year. Now I have to turn it on a dozen times or so before it will stay on. Turns on for 20 sec then shuts down. Turn on 12 x's and it finally stayed on. Don't know what will happen next time I'm out. Can't have this happening on a night trip. According to Garmin Website this is a discountinued model. Hoped someone else had problem and fixed. Thinking it maybe a thermal prob. W/O schematics hard to TS.

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  • eastwood7 Jun 29, 2009

    Thanks so much. Its been driving me crazy. I almost sent it back for refirb at a flat rate of $170 !!

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I had the same problem. In your settings you can set this thing to monitor your battery's power so it auto shut down if your battery goes below 11.2 volts or so. I disabled this and it has worked ever since.

Posted on Jun 26, 2009

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On mine, it was the power cable itself. I had been living with sporadic shut downs for several years. Then I sheared off my transducer. When I replaced the transducer, it forced me to a new power cable. Problem solved. I should have known better, my street pilot 3 and my colormap both had similar issues that a new power cable resolved.

Posted on Mar 30, 2010

  • Youdog99 Mar 31, 2014

    4 years after I replaced my cable, I started having problems with the unit powering up again. I checked the boat side of the connector and saw that the brass female connectors were ever so slightly splayed. Using a very fine watch repair screwdriver, I pushed the two sides of each receptacle back together. Then I made sure all of the connectors were clean. Hooked it up and it powered right up. Now I make sure to just pull the plug straight out, rather than wiggle it off. Works great!!

  • Youdog99 Nov 05, 2014

    6 months later, the replaccment power cable gave up. Upon refreshing my memory on the GPS wiring, I learned that I can replace the power side of the harness while keeping the 4 year old transducer. Found a new Garmin power pig tail that includes a weather cap on a popular Auction Site for less than $30. I think my previous recommendation is a temporary fix to giveyou time while you look for a new power pigtale.

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Posted on Jan 02, 2017

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