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Thread: Capacitor Replacement

  1. #1
    Eddie Foy's Avatar
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    Capacitor Replacement

    This is for you Webb. The capacitor in the photo was wired from the alternator output (A) to ground. I assume it was to filter noise. My meter say 6 nF. Does that sound right. What is the typical value and where is a good place to get a new one.

    3A410BEF-7A82-4535-8D1C-FA9A856AF221.jpeg
    "Put out my hand and touched the face of God!"

  2. #2
    Eddie Foy's Avatar
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    Looks like the Cessna part is S1915-1. Can't see spending $80 for one. What is the Farad rating of the Cessna piece?
    "Put out my hand and touched the face of God!"

  3. #3
    wireweinie's Avatar
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    Yikes. $80 dollars is on the low side!
    This is just a filter capacitor and the S-1915-1 part number comes up as installed as per an SB. Even if you leave it off, the charging system will still work. I'm not finding a spec on it, on line. Possible a spec may be ink stamped on a new one if you can get eyes on. I've seen various values on these filters but my opinion is that the 6 nf is a good reading. If you need to replace it with something cheaper, do a search for part number 63897-006.

    Web
    Life's tough . . . wear a cup.
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  4. #4
    Eddie Foy's Avatar
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    I will clean it up and re-install it. If I have radio noise I will deal with it. My vhf is a Garmin 225. I think they have pretty good internal noise filtering.
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    irishfield's Avatar
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    I THINK I still have some of those. I had a whole box of them at one point. Will try to remember to look tomorrow...
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  6. #6

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    Quote Originally Posted by wireweinie View Post
    I'm not finding a spec on it, on line. Possible a spec may be ink stamped on a new one if you can get eyes on.
    Lonestar Aviation makes a PMA approved replacement for the Cessna part - I have one at the hangar and can look up the spec next time I'm down there.

    Chris
    Last edited by airChris; 04-14-2018 at 10:38 AM.

  7. #7
    irishfield's Avatar
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    Sorry Eddie, just got out of the plow truck and a little preoccupied. Just got 18" of snow and in the early am it is going to switch to 16 hours straight of freezing rain. I will try to get in the hangar tomorrow to look..
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  8. #8
    irishfield's Avatar
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    Eddie, I have an OE Cessna S1915-1 (one in the middle) that someone recrimped a connector on the wire and a few brand new replacements that are the same, made by same company, etc but different part number. 6.0 MFD rated at 150VDC and 100*C

    $30US + postage from L9M2C1 if you want either...or anyone else for that matter, I have a few.

    LMK,
    Wayne
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  9. #9
    irishfield's Avatar
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    I guess you don't need this Eddie...

  10. #10
    irishfield's Avatar
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    Well I guess I'll put the box back on the hangar parts shelf...

  11. #11
    Eddie Foy's Avatar
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    Sorry, I didn't see your reply. I appreciate the effort but I think the one I have is still good.


    Quote Originally Posted by irishfield View Post
    Well I guess I'll put the box back on the hangar parts shelf...
    "Put out my hand and touched the face of God!"

  12. #12
    BC12D-4-85's Avatar
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    FYI re alt filter caps: https://www.avweb.com/news/maint/182896-1.html

    Gary

  13. #13
    Tom3holer's Avatar
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    Just go to a auto alternator repair shop and I bet they have a bunch of them for a few bucks.

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