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G3X Installation Manual – GDU 37X Page 2-5
190-01115-01 Revision A
2.5 Installation Considerations
Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are
recommended for installation of the GDU 37X. Refer to Section 1.6 for wiring considerations and to
Appendix A for pinouts.
Connector kits include backshell assemblies. Garmin’s backshell connectors give the installer the ability
to quickly and easily terminate shield grounds and install a configuration module (PFD1 only) at the
backshell housing. The instructions needed to assemble the backshell connector w/Shield Block
grounding system and configuration modules are located in Appendix B.
NOTE
The GDU 37X rear connector (J3701) is electrically isolated. For
installations using shielded cables, a ground pin must be tied to the
connector shell.
2.6 Mounting Requirements
Refer to Appendix C for outline and installation drawings.
2.7 Unit Installation
The GDU 37X is installed by holding the unit flush with the instrument panel and fastening the four
captured 3/32” hex socket head screws to the panel as shown in Figures C-1.1 and C-1.2.
2.8 Maintenance
Maintenance of the GDU 37X is “on condition” only. Periodic maintenance of the GDU 37X is not
required. Instructions for Continued Airworthiness (ICA) are not required for this product under 14 CFR
Part 21 since the GDU 37X has received no FAA approval or endorsement.