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Charging system problem - please help troubleshoot

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nuckolls.bob(at)aeroelect
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Posted: Sat Nov 15, 2014 8:13 pm Post subject: Charging system problem - please help troubleshoot

At 14:26 2014-11-15, you wrote:




The older legacy Cessna's and maybe others used a single push-pull 

Master switch instead of the more common split masters.  The switch 

contained two contact circuits on one switch.  One controlled the 

field of the charging system.



    Yes, but it was the advent of alternators that birthed

    the split rocker . . . was a long time ago so I don't

    recall whether or not any early alternator installations

    went out with the Cole-Hersy push-pull switches.



    Bill, is your airplane fitted with a split rocker

    master switch?



I do not know if the looseness comes from. . .aging, wiring abuse 

when electrical service work is done under the panel, or electrolysis 

from the different metals and moisture.



    I think the rivets were set down against phenolic

    insulator close-out. Not the most dimensionally

    stable material under pressure.



If you are having charging problems and use this type of master swt., 

be sure to check the "tightness" of this riveted joint.  Any 

looseness is a problem.



    Agreed . . .





   Bob . . .

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racerjerry

Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY

Posted: Sun Nov 16, 2014 5:13 am Post subject: Re: Charging system problem - please help troubleshoot

I can tell you for sure that 1968 & 1969 Cessna 172's were equipped with alternators and a push-pull master switch AND no over-voltage protection.  Don't forget that the alternator ground is part of the charging circuit.

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Nov 16, 2014 5:58 am Post subject: Charging system problem - please help troubleshoot

At 07:13 2014-11-16, you wrote:

 	  Quote: 	
		  



I can tell you for sure that 1968 & 1969 Cessna 172's were equipped 

with alternators and a push-pull master switch AND no over-voltage 

protection.  Don't forget that the alternator ground is part of the 

charging circuit.


	


    Good data point. Thanks!  I'm going to the

    Textron Electronics Lab Thanksgiving lunch

    next week. I'll get into the archives and

    see what the evolutionary steps were that

    lead up to the full changeover to alternators,

    rocker switches and ov protection.



    Did those aircraft still have fuses?



   Bob . . .

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racerjerry

Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY

Posted: Sun Nov 16, 2014 6:14 am Post subject: Re: Charging system problem - please help troubleshoot

 	  Quote: 	
		  Did those aircraft still have fuses? 	




My 1969 Cessna 172K has only non-resetable circuit breakers.  The only fuses in the electrical system are mounted on the engine side of the firewall which power the clock and another fuse for the optional ground service plug contactor, if one is installed.

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