Garmin 300XL, King AK950 annunciator, Narco 122D connection chart.

Relay #n: C/NC/NO pinNo refer to AK950 - C common, NC norm clsd, NO norm open
P810, P811 refer to Narco 122D connectors
J101 & J102 refer to Garmin 300XL connectors
Stacked vertical | are connected together

 #1:  C  1  --------------------- P811 p12: ROTOR H IN \ shielded together
 #3:  C  3  --------------------- P811 p10: ROTOR C IN / 
 #4:  C  4  --------------------- P811 p18: STATOR D IN \ shielded together
 #5:  C  5  --------------------- P811 p20: STATOR E IN / 
 #6:  C  6  --------------------- P811 p14: STATOR F IN \ shielded together
 #7:  C  7  --------------------- P811 p16: STATOR G IN / 
 #8:  C  8  --------------------- P811 p01: +LEFT IN  \ shielded together
 #9:  C  9  --------------------- P811 p02: +RIGHT IN / 

#13:  C 13 ---------------------- P811 p04: +FROM IN
#14:  C 14  --------------------- P811 p03: +TO IN
#15:  C 15  --------------------- P811 p23: +NAV FALG IN

 #1: NC 21 ---------------------- P811 p11: ROTOR H OUT \ shielded together
 #3: NC 23 ---------------------- P811 p09: ROTOR C OUT /
 #4: NC 24 ---------------------- P811 p17: STATOR D OUT \ shielded together
 #5: NC 25 ---------------------- P811 p19: STATOR E OUT /
 #6: NC 26 ---------------------- P811 p28: STATOR F OUT \ shielded together
 #7: NC 27 ---------------------- P811 p29: STATOR G OUT /

 #8: NC 28 ---------------------- P810 p28: +LEFT OUT    \ shielded together
 #9: NC 29 |--------------------- P810 p29: +TO, +RT etc./
#14: NC 34 |--------------------| P811 p06: +DOWN IN
                                | P811 p08: -GS FLAG IN

122D P810 p30: +UP OUT <-jumper-> P811 p05: +UP IN
122D P810 p11: +GS FLG <-jumper-> P811 p07: +GS FLAG IN
122D ground: use ground stud on casing.

 #1: NO 41 AC ground

 #2   C  2 ---------------------- p811 p22: GPS display (neg logic)
 #2: NO 42 ground
 #2: NC 22 no connection

 #3: NO 43 --------------------- J101 p14: GPS ROTOR C - shielded
 #4: NO 44 --------------------- J101 p35: GPS ROTOR D - shielded
 #6: NO 46 --------------------- J101 p37: GPS ROTOR F - shielded
 #8: NO 48 --------------------- J101 p01: GPS LEFT - shielded
#14: NO 54 --------------------- J101 p02: GPS TO+
#15: NO 55 --------------------- J101 p03: GPS FLAG+

 #5: NO 45 |
 #7: NO 47 |
 #9: NO 49 |
#13  NO 53 |
#16  NO 56 |-------------------- J101 p4: GPS FLAG-, RIGHT+, FROM+, STATOR E, STATOR G

122D P810 p36: ----> audio panel NAV1 (or NAV2) phones

122D P810 p27: to 1W 12ohm resistor to toggle-dimmer-switch to circuit breaker.
The rest of the power wiring circuit is same as Narco 122D fig. 2-8 14V diagram.

AK950 72   --------------------- J101 p28: appr arm annun
AK950 73   --------------------- J101 p09: appr arm low
AK950 74   --------------------- J101 p13: Appr active annun
AK950 75   --------------------- J101 p20: msg annun
AK950 76   --------------------- J101 p12: arrival annun
AK950 77   --------------------- J102 p13: Seq hold low
AK950 78 to Narco 122D circuit breaker
AK950 40 from AC ground -------  also connect to a "bare wire"
      |                           to attach the wire shields.
      ---------------------- "bare wire"
      |  |  |  |  |  |  |  | (wire shields)

Comments: Really lots of wires packed in the AK950 plug cover
use smallest wires allowed. I used solder cup connector - the
insert connector type would not allow easy connection with
the complex mess here. The solder cup requires more soldering
skills, care and temp controlled solder iron (800F)

Narco 122D/GPS wishes: It is not exactly cheap at about $3,500 USD. I
would have expected a photo sensor activated dimmer instead of old
attach-to-external-dimmer type connection. Also the P811 connector is
really an bulky, ugly connector attachaed to a wire bundle sticking
out of the unit. A simple D-Sub 26 high density connector would be
better (and less expensive) - and even more better if it was built
into the housing.