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  #21  
Old 10-28-2018, 05:14 PM
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Plummit Plummit is offline
 
Join Date: Apr 2010
Location: Covid Country-SoCal
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Quote:
Originally Posted by UnPossible View Post

So electrical experts.... what is the best way to trouble shoot this issue to figure out what is going on?
The best way I know of is to try a replacement Alt and see if the problem is cured.

I had my field CB keep tripping on my PP Alt. I tried a replacement CB and checked the connections. Replaced the Alt and problem solved! If you were closer I would loan you my old unit to try. I loaned it to another guy who used it to make a 1000 nm flight home so I know it works in cruise flight.

Other than that, take it to your local Auto parts shop for testing, but it may or may not show a problem on the bench.

-Marc
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  #22  
Old 10-28-2018, 05:41 PM
n8433w n8433w is offline
 
Join Date: Jun 2011
Location: PA
Posts: 20
Default My experience

I have had some recurring issues with the Plane Power installed on my -8. I have had the pin in the connector fatigue and break ( I now fill the back of the connector with RTV to support the wires). More importantly since my experience with the second problem was similar to what you are currently experiencing is the fit between the bearing that supports the aft end of the armature and the rear housing was not good and allowed the outer bearing race to spin in the housing. The initial symptom was intermittent failure only in flight and once the housing had worn enough it allowed the armature to contact the windings and shorted the internal regulator creating a total failure. My suggestion is to remove the drive belt from the pulley and check for any play in the alternator shaft. The issue with the bearing to housing fit has happened to me on two separate Plane Power alternators even though the drive belt was tensioned per the Plane Power recommended procedure.
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  #23  
Old 10-28-2018, 05:51 PM
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UnPossible UnPossible is offline
 
Join Date: Jan 2008
Location: Granbury, TX
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I am fortunate that some of the folks that developed the Plane Power alternator live near by. I was able to get a hold of a couple of them and they came over this afternoon. They checked all the pins in the connector, etc and everything looks good.

We swapped the internal regulator out of another PP alternator and...... same problem. At startup, everything works fine, bus is at 14.4 volts and charging, but once I increase the rpm above 2,000 rpm I got the same alternator short message.

At this point it doesn't appear to be an alternator issue. I am going to call the folks at VP-X in the morning and see what suggestions they may have for trouble-shooting.
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  #24  
Old 10-28-2018, 08:01 PM
springer springer is offline
 
Join Date: May 2012
Location: AZ/MN
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I had a PP Alt trip every time I took off recently. Changed the master solenoid, no help. Changes the PP brush and VR assembly, no help. Changed the $4.95 battery master switch, Tada!
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