Do I have an overcharge issue?
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New User
Joined: Nov 2017
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From: Missouri/ Ohio
Do I have an overcharge issue?
Barely made it back home from a 2k mile trip with my 2011 F350 6.7 dual alternator truck. It had the 7 year old original equipment batteries cooking pretty good. I checked voltage at each battery both running and turned off. 14.65 and 10.51 volts respectively. Installed a new set of batteries today and I got the same voltage... Was there a short in one or both old batteries or is 14.65 volts too high?
Logistics Pro
Joined: Nov 2004
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14.6 v running is normal. Above 14.7 is considered high.
12.6 v not running is normal. Below 12 v is not good.
Your bad battery may have been screwing up both batteries.
I’d get two good batteries (check the voltage before you install them) and then see what happens.
12.6 v not running is normal. Below 12 v is not good.
Your bad battery may have been screwing up both batteries.
I’d get two good batteries (check the voltage before you install them) and then see what happens.
Post Fiend
Joined: Apr 2002
Posts: 19,311
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From: Waterloo, Iowa
Correct charging voltage is temperature dependent. 14.6 or 14.8 means less than nothing unless temperature is known. Where are you at? It is getting into November after all.
Higher charging voltages in cold weather is because of increased internal battery resistance. Recharging/discharge is a chemical process. If you hit a battery with 14.8 volts in July it will start boiling and be ruined eventually. In January though in North Dakota or Saskatoon at -20° F below that might be right in there for a float charge just to keep it topped off.
Charge table voltages have a correction factor based on temperature. Pencils out to about +1 volt at 20° F, so looking at close to 16 volts to adequately recharge in the wintertime. Anything above 77° F on the other hand, (considered "standard" temperature for a battery) charge voltage needs to be reduced, by about a 1/2 volt at 110° F etc.
http://jgdarden.com/batteryfaq/carfaq9.htm
Higher charging voltages in cold weather is because of increased internal battery resistance. Recharging/discharge is a chemical process. If you hit a battery with 14.8 volts in July it will start boiling and be ruined eventually. In January though in North Dakota or Saskatoon at -20° F below that might be right in there for a float charge just to keep it topped off.
Charge table voltages have a correction factor based on temperature. Pencils out to about +1 volt at 20° F, so looking at close to 16 volts to adequately recharge in the wintertime. Anything above 77° F on the other hand, (considered "standard" temperature for a battery) charge voltage needs to be reduced, by about a 1/2 volt at 110° F etc.
http://jgdarden.com/batteryfaq/carfaq9.htm
More Turbo
Joined: Jan 2010
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Yes, they do. The higher the ambient temp the more the alternator tapers the charge voltage so as not to ‘boil’ the batteries. Converely voltage is higher in colder weather.
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New User
Joined: Nov 2017
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From: Missouri/ Ohio
Ambient temperature was around 55 deg f at the time of voltage check. So I'm now thinking the system is ok to run awhile. I'll check it again when the temps change significantly. Thanks to all for their response!
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