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Old 14-10-2013, 10:25   #1
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Join Date: Aug 2011
Location: Montreal
Boat: Endeavour 35
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Too High Voltage Issue on Garmin 740S Chart Plotter

Very strange issue. We're all stumped here on the dock. If anybody can help that would be greatly appreciated.

PROBLEM: Unit newly displays "Voltage too high! Shutting down in 5s" Then shuts down.

-Unit Voltage (from display) indicates about 34V just before shutting down
-Voltmeter readings at/are:
Unit Plug (power pins) = 13.8v
Power Junction box = 13.8v
Batteries = 13.8v
-Unit is rated to function 10v-32v
-Unit voltage (from display) increases slowly from 13.8v to 34V (eventually shutting off) as engine runs but voltages at other points (incl. plug into unit) remain at 13.8v.
-Voltages at all other plug pins are less than 5v
-Nothing else is connected to unit (No NMEA, no depth sounder, etc.)

Reset to Factory Settings
Remove chart SD card
Change electrical ground from battery ground to RF ground
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Old 14-10-2013, 10:45   #2
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Join Date: Oct 2011
Boat: Valiant 42
Posts: 3,012
Probably the internal analog to digital converter has failed. Could be the reference voltage generator is Zero making the converter think the voltage is at max full scale. Most likely it needs a trip to the factory for repair.
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Old 14-10-2013, 10:48   #3
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Boat: Dragonfly 1000 trimaran
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Re: Too High Voltage Issue on Garmin 740S Chart Plotter

Support | Garmin
"I have never understood why it is "greed" to want to keep the money you have earned,
but not greed to want to take somebody else's money"

-Thomas Sowell
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