[rwarre]

Starting work on the speghetti(wiring). I have a used KT76a with tray and connector. I don't have a clue about hooking up the wires that are used with the connector. I have the pin out diagram but I think I must need an installation manuel. HELP? Randy

 

[az_gila]

Transponders are relatively easy...

Starting work on the speghetti(wiring). I have a used KT76a with tray and connector. I don't have a clue about hooking up the wires that are used with the connector. I have the pin out diagram but I think I must need an installation manuel. HELP? Randy

The pin out should be good enough in this case...

http://www.aeroelectric.com/Installation_Data/KT76A-76C-78A.pdf

Power - Ground

14 volts to pin 11, no connect to pin 12
Ground to pin 1 and pin A

Data lines A1-A4, B1-B4, C1-C4, D4

Just connect to the corresponding pins on your altitude encoder.

Panel lights

Pin 3 to ground, pin 2 to your panel light dimmer output

Leave pins 9, 10 , F with no connection.

Interestingly, there is no switched power for the alt. encoder, so you will have to power that up seperately from your avionics bus.

Hope this helps....

 

[rwarre]

Thanks Gil,

That information is what I needed. Can you tell me what fuse size is reccommended for the 76a. The wire run will be less than three feet. Randy

 

[az_gila]

Glad to help...

That information is what I needed. Can you tell me what fuse size is reccommended for the 76a. The wire run will be less than three feet. Randy

Spruce has it as a 1.8 Amp device

http://www.aircraftspruce.com/catalog/avpages/KT76transponder.php

...so I would use a 3 amp fuse.

22 g would be fine, but I like 20 g for ease of handling. Use red for power and black for your grounds, and any future fault finding will be easier...

Bendix info here... also says 1.8 A

https://commerce.honeywell.com/weba...pCategoryId=10077&pcursel=item5&psysId=item10