Garmin 327 transponder

I bought a used certified Gamin 327 transponder for my 601. I m now ready to wire the inputs. I have a copy of the instillation manual, but I have a few questions I hope I can find answers here. All I want is for the transponder to work, not hooked up to anything else. I plan at a later date to install an ADS B system that does not need to be wired directly to my transponder.

According to the instructions the rear connector has a J3271 plug. The top, looking at the rear, is numbered 1-13 0n top and 14-25 on the bottom. 

Pin 1-     Avionics Master on ?

Pin 13-   Power Ground

Pin 14-   Switched power output

Pin 16- external stand by ?

Pin 24- 14 VDC Panel lighting

Pin 25-   Power ground

Are pins 13 & 25 the same thing?  Does pin one just need a positive voltage when the nav /avionics is turned on? pin 16, is that required? all I want to do is have the minimal wiring to the transponder, any help would be appricated

Gil

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Permalink Reply by David Krakowsky on July 6, 2017 at 8:47am
Hi Gil
Without looking at the wiring diagram, if your PIN numbers are correct, and you want the minimum,
You need pin 1, power, pin 13 and 25 grounds, you can tie them together and ground them to a single ground, you don't need 14, 16, or 24.
Yes, pin 1 needs a positive voltage when the nav/avionics are on.
The reason you want the power off the avionics buss is so that transponder is off when you start the aircraft to prevent any voltage spikes from damaging the transponder.
Let me know if you need any more info.
Dave
Permalink Reply by Gil DeVault on July 6, 2017 at 11:05am

I took the pin numbers right out of the instillation manual. There is also a photo of the socket. Thanks for the information. It is what I thought, but didn't want to blow anything up. There is an additional cable and plug with the wiring harness, but I figured it must be for other uses such as an altimeter or something.

Gil

Permalink Reply by David Krakowsky on July 6, 2017 at 11:28am
Gil
You will need to hook up a altitude encoder,
That's probably what the extra wires are for.

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