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  #1  
Old 03-08-2022, 10:13 AM
Dayton Murdock's Avatar
Dayton Murdock Dayton Murdock is offline
 
Join Date: Jan 2005
Location: Carson City NV
Posts: 568
Default Alternator Over Voltage

Over the past few months my alternator light it has been flickering and the voltage has been going up from 14.6. Over this weekend it was 15.5 and I decided enough is enough so I took the cowl off, remove the alternator. I took it to a professional alternator shop and had them evaluate it. The alternator was without flaws but the technician told me that the condition I was experiencing is possibly a high resistance level in the wire circuit. I found the lug bolt on my battery was loose after tightening it the flickering light and high-voltage went away
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Dayton Murdock
VAF#408 RV4 N359DM O360 C/S, Dual P_Mags, AFS Efis, Trutrak A/P, Leather, Electric trim and flaps, Led lights, Freeflight ADSB and it is painted Red, Flying 1105 hrs 11/28/20

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  #2  
Old 03-08-2022, 12:06 PM
fixnflyguy fixnflyguy is offline
 
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,622
Default Nice find..

Thanks Dayton, makes a good note to put in my troubleshooting category..always learn from the others!
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  #3  
Old 03-08-2022, 01:03 PM
jull_under jull_under is offline
 
Join Date: Nov 2015
Location: Orlando, FL
Posts: 35
Default

What kind of battery do you have ?

Quote:
Originally Posted by Dayton Murdock View Post
Over the past few months my alternator light it has been flickering and the voltage has been going up from 14.6. Over this weekend it was 15.5 and I decided enough is enough so I took the cowl off, remove the alternator. I took it to a professional alternator shop and had them evaluate it. The alternator was without flaws but the technician told me that the condition I was experiencing is possibly a high resistance level in the wire circuit. I found the lug bolt on my battery was loose after tightening it the flickering light and high-voltage went away
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  #4  
Old 03-09-2022, 07:41 AM
BoydBirchler BoydBirchler is offline
 
Join Date: Jul 2020
Location: Indianapolis
Posts: 197
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What brand of alternator do you have? B&C, Hartzel/PlanePower, automotive ND?
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  #5  
Old 03-09-2022, 07:56 AM
Dayton Murdock's Avatar
Dayton Murdock Dayton Murdock is offline
 
Join Date: Jan 2005
Location: Carson City NV
Posts: 568
Default

I have a Nippondenso alternator with a Duracell battery
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Dayton Murdock
VAF#408 RV4 N359DM O360 C/S, Dual P_Mags, AFS Efis, Trutrak A/P, Leather, Electric trim and flaps, Led lights, Freeflight ADSB and it is painted Red, Flying 1105 hrs 11/28/20

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  #6  
Old 03-09-2022, 10:43 AM
andresmith76@hotmail.com andresmith76@hotmail.com is offline
 
Join Date: Nov 2014
Location: Denver
Posts: 25
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Dayton - What voltage reading are you now seeing since securing the battery bolt? Was this the + positive lead connection?
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  #7  
Old 03-09-2022, 12:27 PM
suds suds is offline
 
Join Date: Aug 2018
Location: SC
Posts: 17
Default

Helpful! Thanks for posting 👊
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  #8  
Old 03-09-2022, 02:06 PM
Dayton Murdock's Avatar
Dayton Murdock Dayton Murdock is offline
 
Join Date: Jan 2005
Location: Carson City NV
Posts: 568
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Quote:
Originally Posted by andresmith76@hotmail.com View Post
Dayton - What voltage reading are you now seeing since securing the battery bolt? Was this the + positive lead connection?
Currently it holding at 14.5V with a load of 6-17 amps
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Dayton Murdock
VAF#408 RV4 N359DM O360 C/S, Dual P_Mags, AFS Efis, Trutrak A/P, Leather, Electric trim and flaps, Led lights, Freeflight ADSB and it is painted Red, Flying 1105 hrs 11/28/20

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  #9  
Old 08-12-2022, 04:54 PM
Alexmir Alexmir is offline
 
Join Date: Jan 2016
Location: Buenos Aires
Posts: 10
Default Over voltage / Over current

Hi guys, I have a similar problem.
An RV8 with plane power alternator, Garmin screens. 110 hours of use.
Normally I see voltages of 14.3 and battery loading 3 to 7 amps.
But once in a while I get an alarm, 15.2 volts and +30 amps and even more... sometimes the amp meter goes out of scale.
My alternator fuse (60 amps) blew once! and my Alternator Field breaker popped out a few times too.
Took the alternator for inspection but they say it's fine... that my problem is o the wiring... already inspected everything and don't find anything wrong.
My guess is that having 15.2 volts clearly means the regulator is damaged (maybe fails when getting hot?)... just wandering who is sucking 60 amps! the battery?
It's very confusing...
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  #10  
Old 08-12-2022, 07:52 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,443
Default

If you have a current shunt, make sure the fat terminals are clean and tight.
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