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GTP59 Shield Wire
Planning my wing wiring and notice that the G3X manual on page 21-3 calls for the sheild of the GTP59 wire to be attached to a 16 AWG wire and then the backshell.
I would like to split this cable at the wing root with a CPC connector - but the 16AWG wire will mean it needs to go into large pin connector. I notice the power wire to the temp probe is not anywhere near this big - does anyone know why i cant use a 22AWG wire for this shield pass through the connector (and at the dsub end to the AHARS)? |
That has to be a misprint. There is no electrical reason for a 16 AWG wire for the shield drain wire. That?s pitot heat size! 22 AWG would be fine.
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My harness
I had my wing harness built by a top shop who advertises on here and they did not use 16awg; they used something smaller. If I had to guess, it would be 22awg
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Weird...but..
I agree - this is a shield wire, not a DC return or common.
However, instead of a single 16AWG to carry the shield - use two 20AWG (or 22AWG) wires in your connector. Just a thought. Cheers! |
Best not run it through a connector at all, the shield on the GTP is a heavy double shield probably for good reason.
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And...
And it is a factory cable.
According to the avionics shop, lots of people cut/extend/shorten this cable... |
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In the install manual they talk about extending the cable up to 25ft is fine, and it calls for “three wire twisted shielded cable” - but unfortunately doesn’t recommend a gauge. The gtp59 isn’t listed in the current draw table on page 2-14 but I would imagine it doesn’t draw anything. I was thinking a 22awg would have been fine? https://www.steinair.com/product/22-...ctor-shielded/ Here’s one from a citrus g1000 install - looks like 20 or 22 awg maybe in that little connector? ![]() |
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Does anyone know if Garmin has a support email where you can ask these kinds of questions?
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