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Ground power connector solenoid issue

 
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ogdenk



Joined: 05 Feb 2007
Posts: 38
Location: Syracuse, NY

PostPosted: Thu Aug 23, 2018 4:24 pm    Post subject: Ground power connector solenoid issue Reply with quote

Hi all,
I'm building an RV-10 and wanted to have a GPU connector for convenience, and used Bob's excellent article to do so:
http://www.aeroelectric.com/articles/grndpwr.pdf
I built the version with over-voltage protection, though I left out the indicator light. I have it all wired up but not connected to the battery or battery solenoid yet. The output wire is connected to the GPU solenoid but just hanging in space (and well insulated to prevent shorts while testing).
I applied 12V from a lawn tractor battery to the connector, and sure enough the solenoid closes and 12V appears on the output. Then I open the CB to make sure that it's working, apply power, and the solenoid closed again! I started debugging and what I found is that the S terminals on the solenoid have a low resistance path to the solenoid case with nothing at all connected to them. One has a resistance of about 4 ohms to the case, the other about 15 ohms. The resistance between the S terminals is about 16.5 ohms, which is darn close to spec. The solenoid will close with nothing but the diode connected from the input side to the S1 terminal, and the S2 terminal with nothing on it! This is a Sky-Tec STS-A12, which is definitely the right part.
Sounds like a bad solenoid? This thing is new but I purchased it a couple years ago from ACS so I don't know if I can get it replaced at this point. It was too late to call Sky-Tec today but if this is truly defective I think they'd want to know about it.
Anyone else ever see this? Anything simple I'm overlooking?
Kent Ogden


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user9253



Joined: 28 Mar 2008
Posts: 1325
Location: Riley TWP Michigan

PostPosted: Thu Aug 23, 2018 7:14 pm    Post subject: Re: Ground power connector solenoid issue Reply with quote

It sure sounds like the contactor coil is shorted to the case.
There is a SERVICE BULLETIN for that contactor, but it describes a different failure than what you describe.
http://skytec.aero/wp-content/uploads/2017/10/HET-ASB-072.pdf


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nuckollsr



Joined: 24 Mar 2009
Posts: 82
Location: Medicine Lodge, KS

PostPosted: Fri Aug 24, 2018 7:26 am    Post subject: Re: Ground power connector solenoid issue Reply with quote

Agree that part is bad. This appears to be a relabeled white-rogers 70-902 which you .can buy from allied electronics for abt$25

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