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Wiring Harness Questions

 
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speedy11



Joined: 29 Jun 2015
Posts: 47
Location: Port Orange, FL

PostPosted: Mon Dec 10, 2018 9:00 pm    Post subject: Wiring Harness Questions Reply with quote

Gentlemen (no offense to any women who might monitor this forum),

Aircraft = RV-8
I have removed old EFIS, autopilot, transponder, and radio equipment and I am replacing it with newer stuff. The electrical system is 12 volt.
I am installing:
Advanced Flight 5800

GTN650

ARINC 429

Dynon Com 425 VHF radio

Dynon autopilot

PS Engineering PDA360EX remote audio panel

Echo UAT



I am building a wiring harness to allow the PDA360EX to talk to the GTN650 and Com 425 radio and AFS5800.


I have called each of the manufacturers asking for information to correctly wire the harness. Of course, Garmin will not even talk to me. I called AFS and they say - you need to call PS Engineering. I called PS Engineering and they say - you need to call AFS. Same results with Dynon. Everyone points the finger at the other company and nobody wants to be bothered.


So, I am here to ask if anyone has made a harness between the PDA360EX and a GTN650. If so, perhaps you can give me some guidance. Or perhaps you know of someone who will build the harness for a reasonable price. My local avionics shop wants $800. I understand it is not worth their time and they have to make money to stay open, but that price is too high. PS Engineering will not build a harness for me. AFS and others (haven't checked with Steinair) also want a rather steep price. But, if you know of someone who can make the harness for a reasonable price, I am willing to pay for it to be built.


However, I am going to press on as if I am going to do the entire build myself. I have numerous questions about the connections, so I will ask about a few wires at a time then go and pin them and come back and ask the next question. Maybe, over time, I will be able to eat this elephant one bite at a time.


1. On the PDA360EX audio panel J1 wiring diagram, it lists connections from Com 1 (GTN650 in my case) as being
Com 1 audio Hi

Com 1 Lo

Com 1 MIC Audio Hi

Com 1 MIC Key

On the GTN650, the P1001 connector has the following
Audio Out HI - pin 4

Audio Out Lo - pin 23

And on the P1003 (Com) connector it has

Com MIC 1 Audio IN HI - pin 5

500 ohm Com Audio HI - pin 7

Com MIC 1 Key - pin 11

500 ohm Com Audio LO - pin 18

MIC Audio IN LO - pin 20



I am familiar with the requirement to use shielded 2 and 3 wire cables and the requirement to tie the shield grounds together at the audio panel end and ONLY at that end.
But, can I assume that PDA360EX Com 1 Audio Hi connects to GTN650 Audio Out HI?
Can I assume that PDA360EX Com 1 LO connects to GTN650 Audio Out LO?
Can I assume that PDA360EX Com 1 MIC Audio Hi connects to GTN650 Com MIC 1 Audio IN HI?
Can I assume that PDA360EX Com 1 MIC Key connects to GTN650 Com MIC 1 Key?
What are the 500 ohm Com Audio HI and LO used for, if anything?


In advance, thanks for your help. I will digest these answers, do the wiring, and come back with more questions.


Thanks,
Stan Sutterfield
Daytona Beach


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