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Water in Master switch

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asav8tor(at)hotmail.com
Guest

Posted: Fri Jul 20, 2007 10:39 pm Post subject: Water in Master switch

Vans old 35 amp Honda alt



External Regulator



Split "Cessna" type master switch



-------------------------------------------------------------------------



During rainy weather canopy was opened and water got on the master switch.  

Tried to mop it up but looked like some went down in the switch.



Next day started the aircraft and no amps charging after engine start.  

Normal bus voltage with engine running is 14.2v now showing 12.2 ( no alt 

power )



Shut down and blew compressed air into master switch.



Restarted amps charging and normal bus voltage 14.2 noted.



Flew a series of orientation flights.  (kids summer camp)  After the 6th 

flight noticed a hum/beat sound in the radio/intercom.  Bus voltage was 

15.8v



Shut off alt on split master, voltage went down to 12.6v then turned alt 

switch back on voltage returned to normal 14.2 hum/beat went away.



After engine start the higher voltage was noted several times but could be 

fixed by turning the alt switch off then back on.  It would then stay at the 

normal 14.2v for the rest of the flight.



-----------------------------------------------------------------------------------------------------------



Should I:



(1) Replace the Master switch and recheck.



(2) Replace the Master switch and Voltage Regulator



(3) Replace the alt with a new plane-power 60amp int reg with overvoltage 

protection



I don't want smoke in the cockpit.  If the Voltage regulator was damaged I 

don't want to start the engine again on the old unit.



Thanks in advance guys,



Mike



_________________________________________________________________

http://im.live.com/messenger/im/home/?source=hmtextlinkjuly07

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docyukon(at)ptcnet.net
Guest

Posted: Sat Jul 21, 2007 10:06 am Post subject: Water in Master switch

Change master sw.   Regulator side of switch is creating a voltage drop, 

and telling regulator to increase output voltage. 99.9% sure it will cure 

your problem of over voltage              Bill



---

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asav8tor(at)hotmail.com
Guest

Posted: Sat Jul 21, 2007 6:08 pm Post subject: Water in Master switch

New switch installed.  All is good.  Rock steady again at 14.2v



Took the old switch apart.  Looked like a whole lot of junk in there.  AL 

dust and junk from when the acft was built?  It was moist and almost pastey.



Thanks,



Mike



_________________________________________________________________

http://newlivehotmail.com

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jabowenjr(at)hotmail.com
Guest

Posted: Sat Jul 21, 2007 7:05 pm Post subject: Water in Master switch

Hey Mike, If this is about your RV-4 I think you should just give up and 

consider just giving it to me.

;>)



Jim Bowen -                                                                  

                                                         Hope ya get it 

figured out.



 	  Quote: 	
		  From: "Mike Adams" <asav8tor(at)hotmail.com>

Reply-To: aeroelectric-list(at)matronics.com

To: AeroElectric-List(at)matronics.com, asav8tor(at)hotmail.com

Subject: Water in Master switch

Date: Fri, 20 Jul 2007 23:37:18 -0700




<asav8tor(at)hotmail.com>



Vans old 35 amp Honda alt



External Regulator



Split "Cessna" type master switch



-------------------------------------------------------------------------



During rainy weather canopy was opened and water got on the master switch.  

Tried to mop it up but looked like some went down in the switch.



Next day started the aircraft and no amps charging after engine start.  

Normal bus voltage with engine running is 14.2v now showing 12.2 ( no alt 

power )



Shut down and blew compressed air into master switch.



Restarted amps charging and normal bus voltage 14.2 noted.



Flew a series of orientation flights.  (kids summer camp)  After the 6th 

flight noticed a hum/beat sound in the radio/intercom.  Bus voltage was 

15.8v



Shut off alt on split master, voltage went down to 12.6v then turned alt 

switch back on voltage returned to normal 14.2 hum/beat went away.



After engine start the higher voltage was noted several times but could be 

fixed by turning the alt switch off then back on.  It would then stay at 

the normal 14.2v for the rest of the flight.



-----------------------------------------------------------------------------------------------------------



Should I:



(1) Replace the Master switch and recheck.



(2) Replace the Master switch and Voltage Regulator



(3) Replace the alt with a new plane-power 60amp int reg with overvoltage 

protection



I don't want smoke in the cockpit.  If the Voltage regulator was damaged I 

don't want to start the engine again on the old unit.



Thanks in advance guys,



Mike



_________________________________________________________________

http://im.live.com/messenger/im/home/?source=hmtextlinkjuly07




	


_________________________________________________________________

http://newlivehotmail.com

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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