Yes you have to hook up the red wires together to the + and both black ones to the negative, otherwise the antenna won't be supply in current , and don't forget to insert behind the red wire a fuse and a switch to avoid to discharge your battery .
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Normally this error shows that something is wrong with the antenna itself. If the unit is old it's best to change it out. most gps antennas are only good for about 5-10 years. unless you have had a lightning strike close by then less. The other thing is to make sure that you don't have the internal gps selected in the menu and that you have both terminators on the nmea 2000 network that the LGC-2000 is connected to.
I had the same problem. Sent my entire unit back to Lowrance, but they said it was fine. One year later, I find out that I did not receive or have the correct parts to hook up the GPS unit. I needed the NMEA 2000 T connector and terminator plugs. Look at your manual and hook it up the way the manual says. It will require a NMEA 2000 T and at least one 60 ohm terminator plug. Seems the GPS module sends back some kind of signal that if not absorbed by this thing will mess up your unit. Mine works since I got it hooked up correctly. HD
Before you give up on the LGC-12S you have now though, try plugging the LGC-12S right into the LCX-15CT without an extension cable. If the module not responding goes away...you just need a new extension (GPSX-25G p/n 99-46).
The power cable has a set of yellow, blue, orange, and bare data wires. If these wires short together, you can get the module not responding error.
If all that doesn't help...the LGC-12S is bad.
The LGC-12W p/n 112-06 will work with the LCX-15CT. You probably get
this at many marine electronics dealers or go to lei-extras.com and buy
it straight from Lowrance. They cost $229 so you might want to shop
around putting that money into a whole new system altogether. Make sure you have the latest software updates if you get the newer LGC-12W. These can be downloaded at http://www.lowrance.com/en/Downloads/Product-Software-Updates/
The LGC-2000 is bad would be the most likely cause, but if this started right after you changed the cables, Try connecting the NMEA 2000 network to a different power source than the main power. If you still have the original cables, and you didn't have the problem before, try using those again to make sure there isn't anything wrong with any of the new cables.
But most likely, the LGC-2000 is toast and you will want to contact Lowrance support to see about getting it repaired/replaced.
The receiver needs to be mounted so that it has a clear, unobstructed view of the sky. It will be fine through glass windshields, fiberglass and cloth tops. Keep it at least 2 feet away from the display unit.
"GPS Module Not Responding" is the display units way of telling you there is basically no GPS module connected. You didn't say which unit you have, so I am assuming this is something like an LMS-520? The GPS module is the LGC-3000? If this is the module you have, make sure that you have powered the NMEA 2000 network. The display unit's power cable has a set of red, black, and sheild wires that need to be hooked up to a 12VDC power source. There is a power diagram somewhere in the manual that should show this.
Make sure that you have the NMEA 2000 network connected properly. If it is a newer version, it should just be a single 15ft cable that has two female ends, the module plugs into one end, and the other end plugs into the back of the display. If it came with some T connecters and 120Ohm Terminator caps, then make sure you have that hooked up correctly. There should be a diagram in the manual for that as well but you just connect the two T's together like TT, put the 120Ohm terminators at each end, and run the extensions to the display and GPS module.
There is a decent troubleshootin guide for checking to make sure power is getting to the module at http://primus.lowrance.com/support/resultDisplay.do?gotoLink=92&docType=1000&contextId=426%3A92.273%2C600.639%2C92.113&clusterName=ClusterPublic&lang=english&docset=%2FDocuments%2FTroubleShooting%2FNew+Utility&contentId=42296cce-4f9b-40c8-9dcf-33d5df754009&responseId=135ccbe2cfd4f608%3A1fe88d%3A1225c5cc17c%3A-bac&groupId=4&answerGroup=1&score=986&page=http%3A%2F%2Fprimus.lowrance.com%2Ficr%2FTroubleShooting%2FNew+Utility%2FNU_GPS_ModNR.htm&result=0&excerpt=Module+Not+Responding+The+GPS+module+not+responding+(early+GPS+products+may+also+indicate+coupler+not+responding)+indicates+that+the+unit+and+module+are+no+longer+communicating.&question=gps+module+not+responding&resultType=5000#Goto92
If this doesn't tell you anything, most likely the GPS module is bad.
hi the lgc has to be powered also with the nmea cable,red to+,black and shield to-,you also need a 60ohm terminator atached to the short length coming from the y piece,the manual does not state this very clear and lowrance is not much help
I just went through this with Lowrance. tthe LGC 2000 module on my LCX 20 depth finder "quit responding" out of the clear blue. You have to go Lowrance.com and they have some tests you can follow to see if it is a bad cable or the module itself. I had to replace the module. They charged $99 bucks plus $12.50 shipping for a new one. I bought it spring of 2008, and the unit was 3 months out of warranty when it quit working. Last season I had lower back fusion and didn't use it except for 2 times late in the season. Getting ahold of Lowrance is going to be an experience. I called twice and waited on hold over 35 minutes before I was suddenly cut off both times. I tried email too, but it took 3-5 days to receive a response. Mine broke down June 18 of this year. I started trying to get hold of Lowrance the next day. By the time all the back and forth emails with the delayed responses were done, I received my new unit on July 24. 5 weeks! with out my gps in MN. It is a short season up here as it is. I sure didn't enjoy waiting that long.