Thanks Thanks:  0
Results 1 to 17 of 17

Thread: Alternator

  1. #1
    Lisa Martin LMartin's Avatar
    Join Date
    Jan 2012
    Location
    Coeur d'Alene, ID
    Posts
    120
    Post Thanks / Like

    Alternator

    For lack of finding answers anywhere else…I am flying a C185 on Wip 3730s. A new alternator was put on within 100 hours. I just lost the new one today. It’s a Hartzell Plane Power and an IA said they are junk alternators, but I’m having trouble finding anything else. What’s a good alternator for an IO520D?


    Sent from my iPhone using SuperCub.Org mobile app

  2. #2
    wireweinie's Avatar
    Join Date
    Aug 2013
    Location
    Palmer, AK
    Posts
    4,487
    Post Thanks / Like
    What were the original symptoms and what are the symptoms now?

    Find a new IA.

    Web
    Life's tough . . . wear a cup.
    Likes Richgj3, jrussl liked this post

  3. #3
    Lisa Martin LMartin's Avatar
    Join Date
    Jan 2012
    Location
    Coeur d'Alene, ID
    Posts
    120
    Post Thanks / Like
    I had to start on battery and then turn the alternator on or it wouldn’t come online. Today in flight the low voltage light came on after about 30 min and wouldn’t cycle back on. On the ground, the regulator has a green light and a voltmeter shows 24v at the ACU and nothing at the alternator.


    Sent from my iPhone using SuperCub.Org

  4. #4
    wireweinie's Avatar
    Join Date
    Aug 2013
    Location
    Palmer, AK
    Posts
    4,487
    Post Thanks / Like
    Sounds like a stock ACU and Plane-power alternator, is that correct? Does your ACU use a small circular connector with three wires in it? If so which wire has 24V on it?

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

  5. #5
    Lisa Martin LMartin's Avatar
    Join Date
    Jan 2012
    Location
    Coeur d'Alene, ID
    Posts
    120
    Post Thanks / Like
    Yes. Alternator was replaced, the ACU was not. It was a wire with white shielding, on the left. Supposed to be the field.Click image for larger version. 

Name:	IMG_3700.JPG 
Views:	41 
Size:	209.7 KB 
ID:	61171


    Sent from my iPhone using SuperCub.Org mobile app

  6. #6
    wireweinie's Avatar
    Join Date
    Aug 2013
    Location
    Palmer, AK
    Posts
    4,487
    Post Thanks / Like

    charging system

    Judging by your pic and description, this should be the wiring diagram for your aircraft alternator system. With the engine off, battery and alternator switched on, check the voltage at the following points.
    - ACU pin 3, should be battery voltage
    - ACU pin 1, should be something less than battery voltage, but not 0 volts.
    - ACU pin 2, should be battery voltage

    - Alternator field terminal, should match voltage on ACU pin 1
    - Alternator output terminal, should be battery voltage

    Let me know what you find.

    Web
    Attached Files Attached Files
    Last edited by wireweinie; 05-19-2022 at 03:17 PM. Reason: OCD sucks
    Life's tough . . . wear a cup.

  7. #7
    Lisa Martin LMartin's Avatar
    Join Date
    Jan 2012
    Location
    Coeur d'Alene, ID
    Posts
    120
    Post Thanks / Like
    So far we have 0 on both the alternator field and alternator output terminals.


    Sent from my iPhone using SuperCub.Org

  8. #8
    Lisa Martin LMartin's Avatar
    Join Date
    Jan 2012
    Location
    Coeur d'Alene, ID
    Posts
    120
    Post Thanks / Like
    0 at both alternator and field alternator breakers.
    0 at switch.
    (Jaeden tested and got voltage at the pitot heat breaker, because we were worried that the multimeter wasn’t working)


    Sent from my iPhone using SuperCub.Org

  9. #9
    wireweinie's Avatar
    Join Date
    Aug 2013
    Location
    Palmer, AK
    Posts
    4,487
    Post Thanks / Like
    Look under the panel at the back of the breakers. They should all be tied together with an aluminum or copper strip. I suspect a bad connection on this strip. Since the output breaker is typically at the end of the row, start checking from that breaker and moving along the row until you find voltage. The bad connection will be between the last breaker with no voltage and the first one with voltage. Web
    Life's tough . . . wear a cup.

  10. #10
    stewartb's Avatar
    Join Date
    Oct 2012
    Location
    Wolf Lake, AK
    Posts
    7,193
    Post Thanks / Like
    B&C LX-60 alternator with their LR regulator. Easy field approval.

  11. #11
    Lisa Martin LMartin's Avatar
    Join Date
    Jan 2012
    Location
    Coeur d'Alene, ID
    Posts
    120
    Post Thanks / Like
    Jaeden set his multi meter to 200 and got:

    Pin 1 = 0 volts
    Pin 2 = 24 volts
    Pin 3 = 24 volts

    Now field and battery terminal on alternator are at 24 volts.


    Sent from my iPhone using SuperCub.Org

  12. #12
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    21,885
    Post Thanks / Like
    Recently installed a rebuilt alternator on a friend's Cherokee after troubleshooting the system. Shortly there after the alternator went out again. Troubleshooting showed it was the alternator. Sent back to the rebuilder, they found the issue and repaired. Alternator worked fine but the got intermittent. Finally got it to quit so I could troubleshoot and found the old original voltage regulator had quit. Replaced and all has been good. If someone had told me this story I would have questioned their troubleshooting but I checked and triple checked. Sometimes stuff happens in triplets.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  13. #13
    Lisa Martin LMartin's Avatar
    Join Date
    Jan 2012
    Location
    Coeur d'Alene, ID
    Posts
    120
    Post Thanks / Like
    Thank you. The ACU has a green light, but it was underwater so we’re going to order both.


    Sent from my iPhone using SuperCub.Org

  14. #14

    Join Date
    Jul 2018
    Location
    Petaluma, CA & Kasilof, AK
    Posts
    38
    Post Thanks / Like
    Quote Originally Posted by Steve Pierce View Post
    If someone had told me this story I would have questioned their troubleshooting but I checked and triple checked. Sometimes stuff happens in triplets.
    After having the same experience, more than twice, I now install the Hartzell Plane Power units only with a matched Plane Power ACU and fully rewire with fresh grounds. This has been 100% so far and I still don't understand why it seems to be needed. I think I understand electricity pretty well but repeat failures make me unstable. I have had the Plane Powers trip off intermittently and need reset in flight with new Lamar & Zeftronic ACU's with no amount of grounding or connection cleaning making a difference.
    I have found that even with a matched alt & ACU there can be problems if the early in-line over voltage module is left in the Cessna's when running a regulator that has that function built in. Like Hartzell products or not, they seem to be the main producers today.
    Likes LMartin liked this post

  15. #15
    Lisa Martin LMartin's Avatar
    Join Date
    Jan 2012
    Location
    Coeur d'Alene, ID
    Posts
    120
    Post Thanks / Like
    I don’t know where the over voltage module is?


    Sent from my iPhone using SuperCub.Org

  16. #16
    wireweinie's Avatar
    Join Date
    Aug 2013
    Location
    Palmer, AK
    Posts
    4,487
    Post Thanks / Like
    Quote Originally Posted by LMartin View Post
    I don’t know where the over voltage module is?


    Sent from my iPhone using SuperCub.Org
    On your system, the over voltage module is built into the ACU/regulator.

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

  17. #17
    Lisa Martin LMartin's Avatar
    Join Date
    Jan 2012
    Location
    Coeur d'Alene, ID
    Posts
    120
    Post Thanks / Like
    Oh good.


    Sent from my iPhone using SuperCub.Org

Similar Threads

  1. PA-12 Alternator STC/PA-18 alternator question
    By glassjet in forum Experimental Cubs
    Replies: 8
    Last Post: 12-27-2005, 01:39 PM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •