From A Garmin Gma 340 - Garmin GMA 35 Installation Manual

APPENDIX A INSTALLATION CONSIDERATIONS FOR UPGRADING

FROM A GARMIN GMA 340

NOTE
This appendix contains installation considerations for upgrading from a Garmin
GMA 340. This is not a set of comprehensive installation instructions for installing a
Garmin GMA 35 in place of a Garmin GMA 340. Read this manual in its entirety before
starting any installation.
A.1 Mechanical Considerations
• The GMA 340 installation rack is not compatible with the GMA 35. Refer to Section 2 of this
manual for a list of installation materials.
• The GMA 340 backplate and connectors are compatible and may be reused, however the
GMA 340 backplate will need to be oriented to accommodate the GMA 35. Refer to Appendix B
and C of this manual for proper backplate orientation.
A.2 Electrical Considerations
Below is a list of GMA 340 pins that may need to be modified to accommodate the GMA 35. Refer to
Section 4 and Appendix C of this manual for a list of pin functions and interconnect examples.
• GMA 340 J1 pins 23 through 28 (Com Spkr Loads) – COM speaker loads connected to these pins
should be removed before installing the GMA 35. If the connected radios require speaker loads,
the use of external load resistors is recommended.
Below is a list of GMA 340 pins that are marked as RESERVED on the GMA 35.
• GMA 340 J2 pin 6 (14V Lgt/28V Lgt Lo) – This pin is marked as RESERVED on the GMA 35.
No wiring change is required.
• GMA 340 J2 pin 21 (Swap Return) – This pin is marked as RESERVED on the GMA 35. No
wiring change is required.
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GMA 35/35c Installation Manual
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