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Old 03-22-2021, 12:21 PM
P51Matt P51Matt is offline
Join Date: Jun 2011
Location: Lees Summit, MO
Posts: 31
Default GTN650 Power

I am in the process of wiring my panel and I am now on the GTN650. The manual says to use 18 gage wire for the power on the com side. I am having difficulty trying to get the wire into the d-sub pin. Does anyone have a trick to making the wire fit? I am trying to avoid having to trim the inner conductor wires since that would defeat the purpose of having the larger wire.

Matt German
Lees Summit, Missouri
RV-10QB N142LM: Flying 270+hrs
RV-8 Eventually, working on engine and wiring
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Old 03-22-2021, 12:43 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,943

There are three power pins on the GTN-650 for COMM power, two pins for NAV power for just this reason (pins are too small for a #18 wire).

Use #22 wire in each pin, then splice the three comm power to a single #18 wire. The two NAV power wire to a #18 wire as well. Solder and shrink tube.

Be mindful of all the pins that go to ground. Here again use #22 wire and join all at a common ground.


Last edited by Carl Froehlich : 03-22-2021 at 03:16 PM.
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Old 03-22-2021, 06:12 PM
pilotkms's Avatar
pilotkms pilotkms is online now
Join Date: Mar 2007
Posts: 470

They also make these special pins for that job (the 2 on the far right). Got them from Stein if I recall. Had to call them.

RV 7A RV #9700 May 2017
N325KS the Flying K
Built in SoCal KCCB, now in GA @ KPXE
600+ Hours & 7X cross the USA
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Old 03-22-2021, 09:06 PM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Southwest
Posts: 1,414
Default Just me

Originally Posted by pilotkms View Post
They also make these special pins for that job (the 2 on the far right). Got them from Stein if I recall. Had to call them.

Although you can use special contacts that have oversize barrels, I think it would be better to use thinner wires in multiple pins. The multiple pins for power and ground provide a more reliable power source (redundant contacts) and doesnt run the risk of overloading a single contact
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

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