I had this same problem with my Rino 530. I searched google with no luck. As I was on the phone with Garmin, I put side pressure on the adapter (that plugs into the clip, which clips to the battery) and the red light would stay on. They said I needed a new wall charger and clip. So in the mean time I wrapped electrical tape around the adapter to keep pressure on it. Charges great now. Hope this helps!
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check the battery voltage as low voltage can cause the unit to display errors and prevent the sonar from starting up. This unit is more sensitive to low voltage than many other electronics. If charging the battery or replacing it with a known good battery doesn't work then contact garmin for a replacement of your fishfinder.
The really only way one can tell if batteries are being charged is assure them are topped off then trickle charge them with external charger overnight and then check the voltage is 13-14.5 VDC. If not check that battery life is not expired and exchange them if it is. ALSO... one can always extend the life of batteries (deep-cycle) by charging them with a large professional automotive unit in the high power START position over night. WARNING: Assure the caps are loose as you "boil away" the plate corrosion over night due to the very explosive H2 gas generated. No smoking!!
Fis\rst of all is the inverter supplying 120 VAC? when turned on?. If so the inverter seems to be working.I think your problem is in the truck alternator/charging system. The inverter is independent of this charger..
PRobably a defective logic board at this point. Was the jack loose before? Can you measure if the voltage goes in using a multimeter? If the jack is connected properly and it does not turn on, it's your board. If all else fails, there are third party Garmin repair services that will fix it for cheap.
I have the same Garmin product. It had a problem displaying anything. I went to the Garmin web site and got tech support. They fixed the problem by telling me what to do. Try them befor you throw it away. But it sounds un-repairable