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190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 3-13
3.6 Electrical Installation Procedure
3.6.1 Special Tools Required
A crimp tool meeting MIL specification M22520/2-01 and a positioner/locator are required to ensure
consistent, reliable crimp contact connections for the rear D-sub connectors. Refer to Table 2-14 for a list
of recommended crimp tools. A milliohm meter is required to check GTN and optional GMA 35
installation bonding to aircraft structure or instrument panel.
3.6.2 Wire Harness Buildup
The installation kit for the GTN and optional GMA 35 include connectors and crimp contacts. Use wire
specified in Section 2.3.2 for all connections. Make the crimp connections with a crimp tool as specified
in Table 2-14.
Refer to the interconnect diagrams in Appendix E and Appendix F for the appropriate connections. Use
22 or 24 AWG wire for all connections. For power and ground, use the wire gauge specified in the
interconnect drawing in Appendix E, then 22 AWG for the short length from the splice to the connector,
for high-density connectors only. Install the configuration module as described in Section 3.6.3.2. Once
the cable assemblies have been made, use anti-chafe tape and attach the backshell/connector to the rear of
the mounting unit. Route the wiring bundle as appropriate. Avoid sharp bends that may damage the wire
bundle.
Allow adequate space for installation of cables and connectors. The installer supplies and fabricates all of
the cables. See interconnect diagrams in Appendix E and Appendix F. Refer to Section 4 for connector
pinout information. All electrical connections to the GTN are made through the following connectors
provided by Garmin:
J1001 Main – 78-pin high-density D-Subminiature connector (male)
J1002 Main – 26-pin high-density D-Subminiature connector (male)
J1003 COM – 44-pin high-density D-Subminiature connector (male) (GTN 635/650/750 only)
J1004 NAV – 62-pin high-density D-Subminiature connector (male) (GTN 650/750 only)
J1005 I/O – 62-pin high-density D-Subminiature connector (male) (GTN 7XX only)
All electrical connections to the GMA 35 are made through the following connectors provided by
Garmin:
J3501 – 44-pin high-density D-Subminiature connector (male)
J3502 – 44-pin high-density D-Subminiature connector (male)
Construct the wiring harness according to the information contained in this and the following sections.
Cable lengths will vary depending upon installation. Strip all wires going to the connectors 0.17”. Insert
the wire into the pin and crimp with one of the recommended (or equivalent) crimping tools. Insert the pin
into the connector housing location as specified by the interconnect drawing in Appendix E. Verify that
the pin is properly engaged into the connector by gently tugging on the wire. Route and secure the cable
runs from the GTN and GMA 35 away from sources of electrical noise.
Section 4 provides the pin-out information for the GTN as well as the GMA 35. Required connectors and
associated hardware are supplied with the connector kits.
93


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