Originally Posted by Texel Tom
Its' your shout but there's some stuff you can check yourself before sending everything back especially as it sounds as if you may be out of warranty.
I didn't understand your reply regarding the LGC visible in the menu. If the warning appears 'GPS Module Not Responding' it means that communication has been lost between the head unit and the antenna. This would mean that when you look at the device list in 'Bus Set Up' it would not show.
Also please be a little more clear on additional NMEA2000 devices. This fault may be a result of Bus conflicts which occur when you have multiple devices on the network. You say 'Not anymore' does that mean you did have other equipment which are no longer visible.
There are software updates available for both the GM3500 and LGC2000 which deal with these NMEA2K issues hence the questions.
If you want to troubleshoot this yourself its something like this:-
1. Power - check connector nearest antenna and work back to unit.
2. Software - GM3500 v. 1.8.0
3. Software - LGC2000 v. 1.9.0
4. Soft reset (does not effect saved waypoints etc)
Please be certain that all three wires from the NMEA2000 Data cable are connected. Black and Shield should be joined together and connected to ground. If not a charge will build up in the cable and knock out the antenna and ultimately destroy it. This will manifest itself as an intermittant fault which becomes permanent!
hi tom i also have a problem with my lgc 2000. ive done all the voltage checks on the cable i even had to 2years ago cut the plugs off and re solder the cable back together as they got bad corrision and the pins fell out, hence the unit didnt work.
my question is re the voltage on the individual cores got 12.7v on negative from battery to the grounding wire (bare) in the cable which feeds the antenna. is this right seems a little weird that there is 12.7v on the ground wire when i thought there should be none to the negative??
and about 3.7v on all cores red white and blue, and black 0v of course because it comes from the negative battery terminal.
hope you can help me out cheers adam