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Thread: Garmin G3x Wiring Questions

  1. #1
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    Default Garmin G3x Wiring Questions

    Hey everyone! Working on wiring and my brain hurts! I am going to have lots of wiring questions so I figured I should start another thread instead of on the build log?


    I am currently working on wiring up the gea-24, which is the box that all the engine senors connect to. The manual shows (I think) a 2 conductor wire coming from the CHT to the GEA-24. It is saying most of the sensors, other than the egts, need to have Garmin Shield block ground, which I assume is grounding the shield to the backshell? Also with lots of sensors needing to be grounded to the backshell do you just start stacking the grounds? Lastly it shows the 2 conductor wire going to each CHT. One as the signal and the other grounded to the aircraft. It is showing the ground to be on the end where the CHT probe is? Not sure what you do there? Is it okay practice to run a single shielded wire from the CHT probe to the GEA-24 that then the shield is grounded at the backshell of the GEA-24, and then run another shielded wire from the GEA-24 for that CHT to the ground bus for the aircraft?

    Sorry I know there is a lot of questions there, any input would be helpful!
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF
    N53TF

  2. #2
    Senior Member Flybyjim's Avatar
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    Default Re: Garmin G3x Wiring Questions

    Hi Dustin,

    After reading the manual setup I had the harness made for my whole G3X system, this is one area I felt it was better to have someone build it that did it every day. I used Steinair for this service.

    Jim

  3. #3
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    Default Re: Garmin G3x Wiring Questions

    I know the feeling! Seems like I need to just hire someone to come out and wire it all up for me🙂
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF
    N53TF

  4. #4
    Senior Member Flybyjim's Avatar
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    Default Re: Garmin G3x Wiring Questions

    Steinair was a great company to work with, very patience and helpful. I am going to be painting this fall and hope to fire up the panel before year end.

  5. #5
    Senior Member efwd's Avatar
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    Default Re: Garmin G3x Wiring Questions

    Don't be fooled by the belief that the shop has people who do it everyday. You might be surprised, as I was. Go with Stein Air. They sponsor this site too.
    Eddie Forward
    Building
    SS7, 912iS, Garmin G3X

  6. #6
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    Default Re: Garmin G3x Wiring Questions

    Hi Eddie! Yeah I think I am going to charge forward trying to figure this out. Looking back I think I would have gone with AFS or Dynon pre-wired panel from Stein Air. I feel like I am too deep to look back now. Eddie did you run your CHT sensor wire to the probe? The drawing has me to believe the CHT probe is grounded next to the probe itself on the engine, but I dont see why I can't ground the sensor at the ground bus bar coming from the GEA-24?
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF
    N53TF

  7. #7
    Senior Member efwd's Avatar
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    Default Re: Garmin G3x Wiring Questions

    Hey Dustin, I couldn't offer any advice because the 912iS has all that stuff wired already. I just had to get a "pig tail" harness to bridge from the engine harness to the ECU. I only had one sensor to wire and that was the fuel flow sensor. Sorry I couldn't help. I get it, I would wire my own stuff if I do it again. I don't much care for the fit of my harnesses.
    Eddie Forward
    Building
    SS7, 912iS, Garmin G3X

  8. #8
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    Default Re: Garmin G3x Wiring Questions

    Next question is the audio from the G3x. Is the mono for warnings and stereo for music? I am guessing I should hook up both just trying to understand what each one is for?
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF
    N53TF

  9. #9
    Senior Member PapuaPilot's Avatar
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    Default Re: Garmin G3x Wiring Questions

    Next question is the audio from the G3x. Is the mono for warnings and stereo for music? I am guessing I should hook up both just trying to understand what each one is for?
    Don't over think this part, but I think you are correct. Just hook the audio up as depicted.
    Phil Nelson
    A&P-IA, Maintenance Instructor
    KF 5, Continental IO-240
    Flying

  10. #10
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    Default Re: Garmin G3x Wiring Questions

    Quote Originally Posted by PapuaPilot View Post
    Don't over think this part, but I think you are correct. Just hook the audio up as depicted.
    Thanks. Trying not to....

    Is there a good help line for garmin? I am guessing I better program that number in my phone!
    Dustin Dickerson

    Building 7ss STI x 2
    Oratex
    29" shock monster
    EP912STI 155hp
    Garmin
    N33TF
    N53TF

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