Cranking issues
Lead Lap
Joined: Aug 2006
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From: Texas
Moderator
Joined: May 2012
Posts: 1,263
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From: Florida
I bought the car about 7 months ago from another member here. He said that he just recently replaced the battery before I bought it. I got an aftermarket alarm installed and I can see the batteries voltage on my remote. When I try to crank it and had issues I see it around 11.6 volts. That took about ten attempts before it started. I have not been paying attention to my voltage before this. So this has happened about 3 times already. On the 3rd time which was 11.6 volts. I have been checking it frequently and its been at 12.4-12.7 volts. While the car is running it will be at around 15.6 volts. I will try and swap out a dry cell battery from my other car and see what happens.
2- 15.6 volts, if it's really 15.6 volts, is WAY TOO MUCH when car is running. If this is real voltage you are cooking the battery by over charging it. That will shorten battery life significantly. The most you should be reading ever is 14.5 or so. But never over 15 volts.
3- 11.6 volts when cranking is on the low side. Likely the battery is toast and can't handle the current.
What brand battery us it? Most batteries have at least a 2 year replacement warranty. If you don't have a receipt their U.S. a date code on the battery and most sources will replace for free if it's still in warranty.
Thread Starter
Intermediate
Joined: Apr 2014
Posts: 270
Likes: 23
From: Texas
1- when are you seeing 12.4-12.7 volts? When it's cranking normally? When the car is not running?
2- 15.6 volts, if it's really 15.6 volts, is WAY TOO MUCH when car is running. If this is real voltage you are cooking the battery by over charging it. That will shorten battery life significantly. The most you should be reading ever is 14.5 or so. But never over 15 volts.
3- 11.6 volts when cranking is on the low side. Likely the battery is toast and can't handle the current.
What brand battery us it? Most batteries have at least a 2 year replacement warranty. If you don't have a receipt their U.S. a date code on the battery and most sources will replace for free if it's still in warranty.
2- 15.6 volts, if it's really 15.6 volts, is WAY TOO MUCH when car is running. If this is real voltage you are cooking the battery by over charging it. That will shorten battery life significantly. The most you should be reading ever is 14.5 or so. But never over 15 volts.
3- 11.6 volts when cranking is on the low side. Likely the battery is toast and can't handle the current.
What brand battery us it? Most batteries have at least a 2 year replacement warranty. If you don't have a receipt their U.S. a date code on the battery and most sources will replace for free if it's still in warranty.
Thread Starter
Intermediate
Joined: Apr 2014
Posts: 270
Likes: 23
From: Texas
1- when are you seeing 12.4-12.7 volts? When it's cranking normally? When the car is not running?
2- 15.6 volts, if it's really 15.6 volts, is WAY TOO MUCH when car is running. If this is real voltage you are cooking the battery by over charging it. That will shorten battery life significantly. The most you should be reading ever is 14.5 or so. But never over 15 volts.
3- 11.6 volts when cranking is on the low side. Likely the battery is toast and can't handle the current.
What brand battery us it? Most batteries have at least a 2 year replacement warranty. If you don't have a receipt their U.S. a date code on the battery and most sources will replace for free if it's still in warranty.
2- 15.6 volts, if it's really 15.6 volts, is WAY TOO MUCH when car is running. If this is real voltage you are cooking the battery by over charging it. That will shorten battery life significantly. The most you should be reading ever is 14.5 or so. But never over 15 volts.
3- 11.6 volts when cranking is on the low side. Likely the battery is toast and can't handle the current.
What brand battery us it? Most batteries have at least a 2 year replacement warranty. If you don't have a receipt their U.S. a date code on the battery and most sources will replace for free if it's still in warranty.
I forgot to mention that I have exhaust cutouts on my car and it's wired so that it stays on even when the car is off. It is wired this way so when I remote start the car I can open/close the cutout. Do yiu think this can be the reason?
Lexus Test Driver
Joined: Dec 2014
Posts: 8,213
Likes: 949
From: Fl
Does the starter labor or slow down like you have a dead battery when turning the engine over?
If not, do the steps above.
Moderator
Joined: May 2012
Posts: 1,263
Likes: 15
From: Florida
I been paying more attention today and while the car is cranked I been having around 14.2-14.5 volts. When it is off I been having 12 volts. Maybe I was getting 15 volts because I charged the battery over night because I thought my battery was bad.
I forgot to mention that I have exhaust cutouts on my car and it's wired so that it stays on even when the car is off. It is wired this way so when I remote start the car I can open/close the cutout. Do yiu think this can be the reason?
I forgot to mention that I have exhaust cutouts on my car and it's wired so that it stays on even when the car is off. It is wired this way so when I remote start the car I can open/close the cutout. Do yiu think this can be the reason?
A healthy fully charged battery should read resting voltage of 12.5-12.6 or so, about an hour after the car has not run. A battery that reads 12.0 resting volts is only 50% charged and may not be enough to start your car.
http://modernsurvivalblog.com/altern...-charge-chart/
I'm not familiar with powered cutouts. If they are in fact draining significant current they could be causing low battery after a while. If it's not too difficult you may want to try to remove the power wire from it and see if that helps.
Last edited by FLYCT; Mar 6, 2015 at 06:29 AM.
Thread Starter
Intermediate
Joined: Apr 2014
Posts: 270
Likes: 23
From: Texas
Good. 14.2-14.5 is perfectly normal when car is already running. That tells me that your charging system is functioning as it should.
A healthy fully charged battery should read resting voltage of 12.5-12.6 or so, about an hour after the car has not run. A battery that reads 12.0 resting volts is only 50% charged and may not be enough to start your car.
http://modernsurvivalblog.com/altern...-charge-chart/
I'm not familiar with powered cutouts. If they are in fact draining significant current they could be causing low battery after a while. If it's not too difficult you may want to try to remove the power wire from it and see if that helps.
A healthy fully charged battery should read resting voltage of 12.5-12.6 or so, about an hour after the car has not run. A battery that reads 12.0 resting volts is only 50% charged and may not be enough to start your car.
http://modernsurvivalblog.com/altern...-charge-chart/
I'm not familiar with powered cutouts. If they are in fact draining significant current they could be causing low battery after a while. If it's not too difficult you may want to try to remove the power wire from it and see if that helps.
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derek97
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Sep 6, 2013 10:24 AM
