Garmin G3X Installation Manual page 354

23.13.3.2 Transducer Output Power
The GSU 73 supplies output power for engine/airframe sensors that may require supply voltage excitation.
The GSU 73 outputs voltage levels of +5, +10, and +12 Vdc, these outputs may be spliced to allow
connection to multiple sensors if needed. Max current specs are listed in the following table.
Transducers that require more current (such as Princeton capacitive fuel quantity converters) must be
supplied from aircraft power instead of GSU 73 transducer power output pins.
Power Supply Output
+5VDC Transducer Power Out
+10VDC Transducer Power Out
+12VDC Transducer Power Out
Pin Connector
55 J732
56 J732
58 J732
57 J732
75 J732
74 J732
23.13.3.3 Magnetometer Power
The GSU 73 outputs supply voltage to the GMU 22 via pins 38 & 39.
Pin Connector
38 J731
39 J731
190-01115-01
Rev. AA
Maximum Continuous Output Current
Pin Name
+12VDC TRANSDUCER POWER OUT
TRANSDUCER POWER OUT LO (GROUND)
+10VDC TRANSDUCER POWER OUT
TRANSDUCER POWER OUT LO (GROUND)
+5VDC TRANSDUCER POWER OUT
TRANSDUCER POWER OUT LO (GROUND)
Pin Name
MAGNETOMETER POWER OUT
MAGNETOMETER GROUND
G3X/G3X Touch Installation Manual - LRU Pinouts
125 mA
100 mA
150 mA
I/O
OUT
OUT
OUT
I/O
OUT
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