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18th May 2024, 03:09 PM
#1
Administrator
15V to 14.8v AGm battery - Too high?
I just noticed my alternator is starting to put out 15v on start up and after 10 or so mins driving it would drop back to 14.8.
Yellow top Optima AGM, pretty new batteries.
Is that too high or is my alternator on its way out?
Might time for a new one and keep this as a spare for the Simpson anyway.
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18th May 2024 03:09 PM
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18th May 2024, 06:23 PM
#2
The 747
I can't answer your question mate but have you checked multiple meters to make sure it's not a misread?
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18th May 2024, 06:26 PM
#3
Administrator
Originally Posted by
Winnie
I can't answer your question mate but have you checked multiple meters to make sure it's not a misread?
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Yeah definitely mate, I too was questioning my gauges and used two different multis and all three were same.
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18th May 2024, 09:11 PM
#4
..........
I am not an expert but I believe an AGM cherge voltage up to 15v is good.
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18th May 2024, 09:11 PM
#5
..........
Darren probably knows more
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18th May 2024, 10:38 PM
#6
Administrator
Originally Posted by
TPC
I am not an expert but I believe an AGM cherge voltage up to 15v is good.
Yeah I’ve read a lot of things on the internet with AGM and it’s such a mix bags of lollies with advice.
I understand AGM are ok with that charge but it’s only just come on so why I guess is my question.
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19th May 2024, 03:03 AM
#7
Moderator
Hmmm. Sounds High. A quick google tells me what i already though and that it may be a faulty Voltage regulator, if this is the case it is probably a very simple fix and any Auto Elec could sort that out quickly.
I did read though it could be a faulty Earth or Neg point. disconnect the battery and disconnect the earth off the Alternator and clean and reconnect and see if that fixes it.
Here is a quick vid to show removing the voltage regulator
This is also a very good vid mate. Watch this from the start but also the 8:50 minute mark he speaks about the Voltage Regulator.
I would not be buying a new Alternator just yet.
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19th May 2024, 02:16 PM
#8
Administrator
Thanks mate, it does sound high but looking the Optima’s website says it’s in range but, at highest point that’s for sure.
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19th May 2024, 02:23 PM
#9
Administrator
Interesting they also mention up to 15.6v for a rapid charge.
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19th May 2024, 05:12 PM
#10
The 747
It's definitely something you need to get sorted out before the big trip though mate!
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