From AllPinouts
Connector pinout for: Garmin GPS 18 PIN

Pin connector as seen from back of unit
| Pin
| Name
| cable color
|
| 1
| not used
|
|
| 2
| not used
|
|
| 3
| not used
|
|
| 4
| not used
|
|
| 5
| not used
|
|
| 6
| not used
|
|
| 7
| not used
|
|
| 8
| not used
|
|
| 9
| not used
|
|
| 10
| not used
|
|
| 11
| alarm
| yellow
|
| 12
| not used
|
|
| 13
| not used
|
|
| 14
| not used
|
|
| 15
| power input
| red
|
| 16
| data in
| brown
|
| 17
| data out
| blue
|
| 18
| ground
| black
|
References

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