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  #11  
Old 03-27-2015, 08:11 PM
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N402RH N402RH is offline
 
Join Date: Oct 2005
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I had the same problem two weeks ago, It was caused by a bad alternator switch. Try turning off your alt switch on the panel and then turn on the alternator circuit in the vpx and see if it stays running.

Rob Hickman
N402RH RV-10
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  #12  
Old 03-28-2015, 03:02 PM
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MCA MCA is offline
 
Join Date: Jun 2005
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Was it working fine before for a good number of hours and now it is not, or are you troubleshooting a problem from first engine start?

An easy thing to check is to make sure the Sec Alternator is set to none (or to your secondary alternator pinout) in the configurator. If the 'Sec Alt' is set to something incorrectly, say your landing lights, it will turn off the alternator when you turn the lights on.

Also check, as Rob said, that the switch is not bad or loose switch wiring. I've had a bad switch problem too and it is easy to troubleshoot. Just look on your EFIS and it will tell you if the VP-X thinks the switch is on or off. It should match the physical state of your switch.
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RV-7 980 hours, IO-390, VP-X (sold)
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  #13  
Old 03-28-2015, 07:04 PM
jtrollin jtrollin is offline
 
Join Date: Aug 2008
Location: Leesburg, va
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Marc,

I don't think it ever worked right, I just never flew long enough to notice until I flew to Florida. I will check the switch as right now that looks the most obvious and easy to test first. Wanted to go today, but it was way to cold..
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http://websites.expercraft.com/jtrollin/
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