GTN 625/635/650 TSO Installation Manual Page 5-7190-01004-02 Rev. C5.2 Power, Lighting, And AntennasThis section covers the power input requirements, lighting bus input, and antenna connections.See Appendix D for interconnect information.5.2.1 PowerPin Name Connector Pin I/OAIRCRAFT POWER (MAIN) P1001 19 InAIRCRAFT POWER (MAIN) P1001 20 InAIRCRAFT POWER (COM) P1003 30 InAIRCRAFT POWER (COM) P1003 43 InAIRCRAFT POWER (COM) P1003 44 InAIRCRAFT POWER (NAV) P1004 51 InAIRCRAFT POWER (NAV) P1004 52 InAIRCRAFT GROUND (MAIN) P1001 77 --AIRCRAFT GROUND (MAIN) P1001 78 --AIRCRAFT GROUND (COM) P1003 37 --AIRCRAFT GROUND (COM) P1003 38 --AIRCRAFT GROUND (COM) P1003 40 --AIRCRAFT GROUND (NAV) P1004 60 --AIRCRAFT GROUND (NAV) P1004 61 --AIRCRAFT GROUND (NAV) P1004 62 --Power inputs P1001-19 and P1001-20 provide power for everything except for the COM radio and NAVradio. Both pins must be connected.Power inputs P1003-30, P1003-43, and P1003-44 provide power for the COM radio. All three pins mustbe connected.Power inputs P1004-51 and P1004-52 provide power for the NAV radio. Both pins must be connected.5.2.2 Lighting BusCAUTIONConnection of the lighting bus to incorrect pins can cause damage to the unit that willrequire return to the factory for repair. Ensure that the lighting bus is connected to thecorrect pins and does not short to any adjacent pins prior to applying power to the unit,including the lighting bus.Pin Name Connector Pin I/OLIGHTING BUS 1 HI P1001 18 InLIGHTING BUS 1 LO P1001 17 InLIGHTING BUS 2 HI P1001 61 InLIGHTING BUS 2 LO P1001 42 InThe GTN can be configured to track 28 VDC, 14 VDC, 5 VDC or 5 VAC lighting buses using theseinputs. Two lighting buses allow for independent control of display and bezel lighting. Alternatively, theGTN can automatically adjust for ambient lighting conditions based on the photocell. Refer to 6.6.6 forinstructions on configuring the lighting inputs.
