This is kind of a strange one. I have an old Garmin GPSmap 196. I recently wired it to my aircraft, including my Dynon Flightdek D180.
The GPS 12V supply is wired to the ship endurance bus switch and seems normal. When I shut the ship's power down I get a GPS message that says something like "External power lost, push any button within 30 seconds to run on battery power". If I don't touch it, the GPS shuts down and the screen in blank, which is what I would expect.
The plug looks like this: http://www.gilsson.com/garmin_gps/cables/rb.htm
Two leads connect to ship's power, and the other two to ground and to pin 19 on the EMS DB37 connector.
In spite of this, the internal AA batteries still wear down, even though the unit is turned off. Is it possible that the data leads that go to/from the Dynon can permit the batteries to drain? Any ideas what I might do to fix this? Thank you.
The GPS 12V supply is wired to the ship endurance bus switch and seems normal. When I shut the ship's power down I get a GPS message that says something like "External power lost, push any button within 30 seconds to run on battery power". If I don't touch it, the GPS shuts down and the screen in blank, which is what I would expect.
The plug looks like this: http://www.gilsson.com/garmin_gps/cables/rb.htm
Two leads connect to ship's power, and the other two to ground and to pin 19 on the EMS DB37 connector.
In spite of this, the internal AA batteries still wear down, even though the unit is turned off. Is it possible that the data leads that go to/from the Dynon can permit the batteries to drain? Any ideas what I might do to fix this? Thank you.