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battery reads 13.3-13.7 volts...dead? #1242931 05/31/12 08:46 PM 05/31/12 08:46 PM
Joined: Mar 2004 Posts: 3,287 Dalton, MA Slipknot440 OP master
Slipknot440 OP master Joined: Mar 2004 Posts: 3,287 Dalton, MA	I had to jump start my battery the other day and after a 30 minute drive it still won't read more than 13.7 volts. Tends to hang around 13.4 but drops down to 12.5 when I brake and if doesn't stall out, it will slowly work it's way back up to 13.3_13.4v if it idles long enough holding the brake. So..is my battery dead/dying?

Re: battery reads 13.3-13.7 volts...dead? [Re: Slipknot440] #1242932 05/31/12 08:52 PM 05/31/12 08:52 PM
Joined: Apr 2012 Posts: 18,880 - R RSNOMO Moparts Torchbearer
RSNOMO Moparts Torchbearer R Joined: Apr 2012 Posts: 18,880 -	Load test it...

Re: battery reads 13.3-13.7 volts...dead? [Re: Slipknot440] #1242933 05/31/12 08:53 PM 05/31/12 08:53 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Maybe, but it sounds like your alternator/voltage regulator need work first. Running you should be looking at 14.2 - 14.5 volts measured at the battery terminals. Batteries will read around 13 volts charged and after sitting a while may drop down into the 12s, that doesn't mean they are dead. R.

Re: battery reads 13.3-13.7 volts...dead? [Re: dogdays] #1242934 05/31/12 11:10 PM 05/31/12 11:10 PM
Joined: Nov 2003 Posts: 624 Modesto CA B BFASTER mopar
BFASTER mopar B Joined: Nov 2003 Posts: 624 Modesto CA	Quote: Maybe, but it sounds like your alternator/voltage regulator need work first. Running you should be looking at 14.2 - 14.5 volts measured at the battery terminals. Batteries will read around 13 volts charged and after sitting a while may drop down into the 12s, that doesn't mean they are dead. R. R. Not dead, but not maxed either. And yes, a voltage regulator could be malfuntioning. Take it and get a load test.....most professional repair shops and the big parts stores have them. If you can, check the voltage between the + cable and post. There shouldn't be more than a .3V drop, if there is then clean the connection thoroughly. 1969 Dodge Super Bee Hardtop 2007 Nissan Altima 3.5SE

Re: battery reads 13.3-13.7 volts...dead? [Re: BFASTER] #1242935 06/02/12 12:11 PM 06/02/12 12:11 PM
Joined: Jan 2005 Posts: 12,424 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,424 Kalispell Mt.	Batteries get a surface charge that allows them to go slightly over a 12.5 or so normal charge, turn the headlights on for about 10 seconds after shutting it off and it should have around 12.5 or so volts. Your problem has to do with a voltage regulator or bad connections or both. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: battery reads 13.3-13.7 volts...dead? [Re: HotRodDave] #1242936 06/02/12 07:01 PM 06/02/12 07:01 PM
Joined: Mar 2004 Posts: 3,287 Dalton, MA Slipknot440 OP master
Slipknot440 OP master Joined: Mar 2004 Posts: 3,287 Dalton, MA	When I redid the wiring harness in my 68 the new harness came with the attchment for early 70's model VR (the ones shaped like an electronic ignition box). Doesn't mean I didn't get a bad VR but the efi seems to like to die under 12.5 volts and I'm running an interstate megatron battery that's 1 month old. Btw I'm geting my voltage readings from efi computer.

Re: battery reads 13.3-13.7 volts...dead? [Re: Slipknot440] #1242937 06/03/12 01:00 AM 06/03/12 01:00 AM
Joined: Jan 2003 Posts: 18,427 UPPER MICHIGAN, MARQUETTE COUN... N NITROUSN I Live Here
NITROUSN I Live Here N Joined: Jan 2003 Posts: 18,427 UPPER MICHIGAN, MARQUETTE COUN...	Quote: I had to jump start my battery the other day and after a 30 minute drive it still won't read more than 13.7 volts That in itself tells you there is a charging or battery problem.

Re: battery reads 13.3-13.7 volts...dead? [Re: NITROUSN] #1242938 06/03/12 06:34 AM 06/03/12 06:34 AM
Joined: May 2003 Posts: 6,570 Downtown Roebuck Ont Twostick Still wishing...
Twostick Still wishing... Joined: May 2003 Posts: 6,570 Downtown Roebuck Ont	Clean your battery connections. Kevin

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