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2 electrical questions - diode and intermittent failure

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nuckolls.bob(at)cox.net
Guest

Posted: Mon Apr 14, 2008 7:11 pm Post subject: 2 electrical questions - diode and intermittent failure

At 04:20 PM 4/14/2008 -0600, you wrote:



 	  Quote: 	
		  



The diode for the battery master, what are the specifications?



Twice now while flying my aircraft (over 100 hours with no problems), my

main power has flickered.  Off and right back on.  I just checked all the

wiring for the master, and the only thing I'm missing is the diode.  Ground

was my obvious place to look, all OK, excellent ground for the master

switch.

My next choice is to change out the master solenoid.  Any other ideas?

Rocket - dual alternator with single battery.  Standard Z-13 wiring.



Thanks in advance,

Jeff


	


   An intermittent battery master would not cause the

   system to go down completely. In fact, it's possible

   on some airplanes that an alternator will run reasonably

   well without a battery . . . complete loss of the contactor

   may not be immediately noticed.



   If you're looking for loose wires, everything between

   the bus and BOTH power sources (alternator and battery)

   should be examined. Unless you soldered your terminals

   on a good tug on the fat-wire terminals is in order.

   I've seen wires installed with inadequate crimp tools

   pull out of their respective terminals without a whole

   lot of effort.



   Bob . . .

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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f1rocket(at)telus.net
Guest

Posted: Tue Apr 15, 2008 5:43 am Post subject: 2 electrical questions - diode and intermittent failure

Hi Bob,



Thanks for the usual quick reply.



Just for my brain...  If the alternator had a loose wire, wouldn't the

battery still supply the required power?  I didn't think I would see the

power drop out if I lost the alternator (I was hoping I would get the low

voltage alarm so I could start the back up alternator).



Jeff



--

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