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Unread 05-24-2013, 07:18 AM   #16
jroth0916
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Are you sure....because a test light should determine if there is a draw on the battery. The light works if enough power passes through it, so it seems like it makes sense to use it to determine if a draw exists. A multimeter works too, but if the issue is intermittent the test light is nice because it provides a simple answer. I have been trying to figure out the issue with the battery for 3 months now and testing voltage and amperage isn't helping, another test might work. Why wouldn't a light test work?

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Unread 05-24-2013, 07:28 AM   #17
alfaitalia
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Quote:
Originally Posted by jroth0916 View Post
Are you sure....because a test light should determine if there is a draw on the battery. The light works if enough power passes through it, so it seems like it makes sense to use it to determine if a draw exists. A multimeter works too, but if the issue is intermittent the test light is nice because it provides a simple answer. I have been trying to figure out the issue with the battery for 3 months now and testing voltage and amperage isn't helping, another test might work. Why wouldn't a light test work?
No - because the light will create a draw on the battery not measure it. Only a multimeter will tell you what you need to know.
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Unread 05-24-2013, 12:59 PM   #18
4Tom
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The issue isn't current draw as the draw has been measured and its fine.
The problem OP has is that its not correctly charging. Bulb won't detect poor charging.

OP disconnect both battery terminals clean terminals and battery poles with fine sandpaper or battery brush refit tightly. While doing this inspect high current leads both positive and negative.

Your charge voltage should be 13.7~13.8 on a fully charged battery. It will be above 13.8 if the battery is low while driving.

If battery terminals are corroded or making poor contact it will reduce the charging voltage. It is impossible to see the mating surface of terminal to battery pole unless you remove it to check.

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Unread 05-30-2013, 10:37 AM   #19
jroth0916
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I cleaned the battery poles and put on new terminals. I used a marine terminal and soldered the wires to copper lugs. The fit is tight for everything. I'll keep an eye on the drops and charging when the car is on. We'll see if this solves the problem.
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Unread 05-30-2013, 01:43 PM   #20
icbm99
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Just something else to look for. I've had battery cables corrode inside the insulation. Look for bulges in the wire, because it can cause charging/electrical issues too.
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Unread 05-31-2013, 03:08 PM   #21
jroth0916
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Cables look good. I have had the new terminals on the Post for 2 days. I'm still seeing voltage drops similar to before but it doesn't seem like the battery is charging more than 12.3 volts. Could the alternator need replacement?
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Unread 05-31-2013, 03:17 PM   #22
04RockyMountain
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Sounds to me alternator is on its way brother. That happened to me but mine dropped a lot faster than that. Changed the belt, battery and the alternator and the problem didn't go away.... so i got a different alternator and everything works great and battery level stays perfect also.
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Unread 06-28-2013, 12:47 PM   #23
jroth0916
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so an update on the draining battery. I haven't been keeping an eye on the voltage but it seems like it hasn't died in almost a month. I haven't done anything other than put a marine terminal connector. If it dies again I'll update the thread again. I think the alternator might have had something to do with it, but can't prove anything until I can duplicate the issue.
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Unread 11-04-2013, 08:39 AM   #24
georged
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I have a similar problem as I only drive my Jeep once a week. The old battery voltage went from 12.49 when first shut off to 11.5 after sitting for 7 days. Took the old battery out and charged it and with it out of the Jeep only goes down to 12.10 after seven days. A new battery in the Jeep does the same as the original. It still starts fine after seven days, but I am concerned that if it sits longer it will not start.
If I connect a slow charge (2 amp) to the battery in the Jeep, do I have to disconnect the battery cables or is it ok to leave them connected?
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