190-01115-01 G3X/G3X Touch Installation Manual - GMC 307 Installation
Rev. AC Page 13-2
13.3 General Specifications
See Section 2.2 for power/current specifications, and Section 2.4.1 for dimension/weight specifications.
13.4 Mounting and Wiring Requirements
13.4.1 Panel Cutout Template
Figure 13-6
can be used as a template when marking the panel for cutout. Dimensions on the figure are to
verify accuracy of printout only, see Figure 13-5
for complete cutout dimensions. A .dxf version of the
drawing is also available for download at www.garmin.com
.
13.4.2 Unit Installation
Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are
recommended for installation of the GMC 307. Refer to Section 2.3
for wiring considerations, and to
Section 25.6
for pinouts.
1. Per Figure 13-2, ensure the pawl latch fasteners are fully retracted and in the vertical position.
2. Hold the unit flush with the instrument panel.
3. Using a 3/32" hex drive tool turn each of the two pawl latches clockwise until tightened to
20 +/-2 in-lbs. When tightened, the pawl latches are in the horizontal position.
Figure 13-2. Pawl Latch
13.4.3 Wiring
The 15 pin connector, pins, and backshell supplied in the GMC 307 installation kit are used to add wiring
for the GMC 307.
It is recommended that a 2 Amp fuse or circuit breaker be used to supply power to the GMC 307
(Figure 26-1.7
). Backup power is optional.
The GMC 307 is connected via RS-232 to any GDU 37X/4XX display (Figure 26-1.7
). The selected GDU
RS-232 channel must be configured for “Garmin Instrument Data”.
If the installation includes a Garmin integrated autopilot using GSA 28 servos, the GMC 307 installation
also includes an RS-232 connection to the GSA 28 roll servo (Figure 26-1.7
). GMC 307 RS-232 channel 1
must be connected to any one of the available RS-232 channels on one of the GDU 37X/4XX units. The
GMC 307 RS-232 channel 2 must be connected to the GSA 28 roll servo RS-232 channel 1 if this roll
servo is installed.
For installations using a non-Garmin autopilot with a GMC 307 controller, refer to Figure 26-2.19
.
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