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mhealydds
Joined: 17 May 2015
Posts: 30
Location: Wichita, KS
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 Posted: Mon Feb 19, 2018 6:28 am Post subject: Charging Issue |
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I have an RV-10 that is about one year and one half old and have had a charging issue for at least a year of it. I have a Plane Power 60 amp alternator (and back-up Plane Power 30 amp alternator) with a Advanced Quick Panel System. Here is east has been going on....
1. My primary alternator never get adequate charge. It hovers around 12.5 to 12.8 volts, sometimes to 13.2 or so, but never above 14 volts.
2. The primary alternator makes an whine when on.
3. The primary alternator shuts off intermittently (I see Amps of down and whine goes off) and then will come back on on its own later or sometimes will when I reset field switch.
4. I can sometimes get full charge (14.2) on ground with only some of avionics on (one EFIS, nav/strobes only).
5. My secondary alternator does not do all this. It works indicated.
Here is what I have tried and checked...
1. Checked and adjusted belt tension on alternator.
2. Added alternator filter.
3. Checked continuity and tightness on all connections.
4. Changed and checked alternator ANL fuse.
5. Got completely new alternator and replaced it.
6. Changed terminal plug on alternator.
7. Been on phone with plane power numerous times and ruined through trouble shooting and can't seem to find and issue with alternator itself.
8. Have not had alternator checked but since I have two alternators doing same thing and both are basically new, I doubt that is the case, but possible.
9. Volt reading on EFIS and multimeter at AFS middle same and same on both EFISs
Any thoughts on what else to check or fix. I feel like I am missing something obvious. The plane with run with with the 12.8 or so volts but that is not what it should be. Could it be AFS module (they don't thing so at AFS), battery, do I need larger gauge wire (I have 8 now). I just don't know know anymore and and stuck on my true amateur status.
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user9253
Joined: 28 Mar 2008
Posts: 1931
Location: Riley TWP Michigan
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| Posted: Tue Feb 20, 2018 5:56 pm Post subject: Re: Charging Issue |
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Measure the current going to the alternator field. An easy way to do that might be to pull the field fuse (or trip circuit breaker) and connect an ammeter in its place. I would expect between 1 and 4 amps of field current.
After use, do not forget to put the meter back on voltage setting.
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Joe Gores |
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Tue Feb 20, 2018 7:40 pm Post subject: Charging Issue |
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I don't recall if it was mentioned, but be very certain the alternator
is grounded to the crankcase and the crankcase has a good ground to the
firewall or central grounding point. Lack of ground or poor ground could
produce the symptoms.
On 2/20/2018 6:56 PM, user9253 wrote:
| Quote: |
Measure the current going to the alternator field. An easy way to do that might be to pull the field fuse (or trip circuit breaker) and connect an ammeter in its place. I would expect between 1 and 4 amps of field current.
After use, do not forget to put the meter back on voltage setting.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=478158#478158
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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