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Grounded - 912UL Voltage Problem

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John Bickham

Joined: 10 Jan 2006
Posts: 170
Location: St. Francisville, LA

Posted: Thu Jul 29, 2010 6:53 am Post subject: Grounded - 912UL Voltage Problem

Just checking if someone has some advice to share regarding 912 voltage problems.



I've been trying to trace down a voltage surge on my 912UL.  Last flight started noticing intermittent voltage surge to 16 plus volts.  Been checking wiring and connections, nothing yet.  Ran engine this morning and now surge is rpm dependent.  High rpm = increasing voltage.  My only guess is that the voltage regulator has gone bad.  Fixing to order a new one.  Wondering if anyone has any experiences or advice that they can offer.  Are there any checks that can be preformed on the regulator itself?  I'm electrically challenged.  Don't know if stator could be problem. 



This one is going on 10 years old.  I'm slowly becoming more tolerant and understanding of things getting old and not working as well as new.



Been trying get plane XC ready to visit a new Kolb, a crippled Kolb driver and daughter in Montgomery, AL.  Just hitting a few bumps.



Any help appreciated.

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_________________
Thanks too much,

John Bickham
Mark III-C w/ 912UL
St. Francisville, LA

I know many pilots and a few true aviators. There is a distinct difference that I have the greatest respect for.

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Thu Jul 29, 2010 7:10 am Post subject: Grounded - 912UL Voltage Problem

John B/Gang:



My experience is a bad regulator/rectifier when they fail on the high side.



Scared to ask how much they want for a replacement.



When are you headed this way?  We'll get Gantt International Airport cut for 

you.



john h

mkIII

 > Been trying get plane XC ready to visit a new Kolb, a crippled Kolb 

driver and daughter in Montgomery, AL.  Just hitting a few bumps.

 >

 	  Quote: 	
		   John Bickham

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Dickk9(at)AOL.COM
Guest

Posted: Thu Jul 29, 2010 7:46 am Post subject: Grounded - 912UL Voltage Problem

Make sure all of your grounds are good between regulator, battery, and  engine.

  [quote][b]

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Thu Jul 29, 2010 8:06 am Post subject: Grounded - 912UL Voltage Problem

John, The regulator for the Rotax alternator is a diode bridge to rectify the AC voltage to DC. If you have a multimeter check the out put of the regulator to see if it's letting AC through. If it is, one or more of the diodes have given up and a new regulator will fix you up. Check over on the Aeroelectric forum, also on Matronics, for more ideas if that isn't the case. 



Rick Girard



On Thu, Jul 29, 2010 at 10:45 AM,  <Dickk9(at)aol.com (Dickk9(at)aol.com)> wrote:

[quote]      Make sure all of your grounds are good between regulator, battery, and  engine.

   	  Quote: 	
		  



get="_blank">http://www.matronics.com/Navigator?Kolb-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	




[b]

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The smallest miracle right in front of you is enough to make you happy....

John Bickham

Joined: 10 Jan 2006
Posts: 170
Location: St. Francisville, LA

Posted: Thu Jul 29, 2010 6:46 pm Post subject: Re: Grounded - 912UL Voltage Problem

John H,



Since you were wondering, new regulator is "just" $170.95.  Just ordered one.



Thanks to all for the help.

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