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Thread: Another Plane power issue

  1. #1
    S2D's Avatar
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    Another Plane power issue

    Wirewienie

    Since you had such good luck diagnosing Gordons problem hoping you could figure mine out.

    Cessna Agtruck running the plane power system.
    Ran fine for a couple years.
    Suddenly this summer it starts spiking and kicking out for a while then kicks back in
    repeating the process til it finally burnt the regulator out.

    Pulled the cowling and found severe fuel leak in that area. (yea thats a whole nother "Holy $hit" story !!!!!)

    Fixed the fuel leak and replaced the regulator.

    everything would work fine under 1000 rpm but above that, same story til finally burnt out another regulator.

    So now I finally get it in the shop for the winter annual and have to figure out whats causing that !!

    Wire shorting ?? loose ??? vibration induced ????

    thanks
    Brian
    I may be wrong but that probably won't stop me from arguing about it.

  2. #2
    Gordon Misch's Avatar
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    https://planepower.aero/wp-content/u...lternators.pdf This didn't do me much good, but maybe??

    I have a voltage regulator enroute from Spruce. If you want, and assuming I confirm I don't need it, I can send it to you instead of returning it to Spruce. I'd cover the UPS from me to you.
    Gordon

    N4328M KTDO
    My SPOT: tinyurl.com/N4328M (case sensitive)

  3. #3
    S2D's Avatar
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    Ok. That works for me.

    Sent from my E6910 using Tapatalk
    I may be wrong but that probably won't stop me from arguing about it.
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  4. #4
    wireweinie's Avatar
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    What did the voltage do during these episodes? Was the voltage constant at 14.2 volts during normal operation? Was it 'kicking out' for high voltage or high current?

    Web
    Life's tough . . . wear a cup.

  5. #5
    wireweinie's Avatar
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    Ok, listen up. The next guy installing a Plane-Power alternator, contact me! I'm making your wire harness for your new charging system!

    Just trying to save time . . . .

    Web
    Life's tough . . . wear a cup.

  6. #6
    S2D's Avatar
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    Quote Originally Posted by wireweinie View Post
    What did the voltage do during these episodes? Was the voltage constant at 14.2 volts during normal operation? Was it 'kicking out' for high voltage or high current?

    Web
    The ammeter was pegging. Doesnt have voltmeter.
    I may be wrong but that probably won't stop me from arguing about it.

  7. #7
    S2D's Avatar
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    Quote Originally Posted by wireweinie View Post
    Ok, listen up. The next guy installing a Plane-Power alternator, contact me! I'm making your wire harness for your new charging system!

    Just trying to save time . . . .

    Web
    Yea im sure that would help.
    I replaced a lot of worn out wiring about 8 years ago.
    But these things take a lot of abuse and im sure a lot more is going to get replaced before i find the problem.
    I may be wrong but that probably won't stop me from arguing about it.

  8. #8
    wireweinie's Avatar
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    The pegged ammeter obviously shows huge current flow. Put a digital voltmeter on the bus and check it when the system acts up. In general, normal or lower voltage means a shorted wire or contact. Higher than normal voltage means possible voltage regulator issues.

    Is the ammeter installed in the alternator output lead or on the main bus feed? If on the main bus feed, does it peg to the positive side of the ammeter or to the negative side?

    Web

    P.S. I'll need the length of wires required if you have a non standard Cessna install.
    Life's tough . . . wear a cup.

  9. #9
    S2D's Avatar
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    Quote Originally Posted by wireweinie View Post

    P.S. I'll need the length of wires required if you have a non standard Cessna install.
    You mean you have the data to make a complete harness for a cessna Ag truck?, Or are you just talking about the alternator circuit?


    Ill check what you asked when i get back , I gave the mechanic enough other discrepancies to fix to keep him busy for a week or two.



    Sent from my E6910 using Tapatalk
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  10. #10
    wireweinie's Avatar
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    I'll do the whole aircraft, including avionics/accessories if you give me the info I need.

    Web
    Life's tough . . . wear a cup.

  11. #11
    wireweinie's Avatar
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    Year/serial number of aircraft
    List of all avionics by make and model
    List of accessories (I'll need diagrams with the ag items. Don't have much access to that stuff)
    List of all items such as nav or landing lights that have been changed over to aftermarket stuff.
    Do you want factory markings on airframe wiring?
    All wires will mil-spec M22759/34-* or M27500-* wiring, white, with laser engraved markings

    Web
    Life's tough . . . wear a cup.
    Likes S2D liked this post

  12. #12
    S2D's Avatar
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    Wow.
    The pilot that owns and flies it for me would love that. Hes always claimed its jinxed.

    Ill see what i can come up with.

    No avionics, just gps, flagger and crophawk.



    Sent from my E6910 using Tapatalk
    I may be wrong but that probably won't stop me from arguing about it.

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