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Unread 05-06-2013, 06:21 PM   #1
stormer1092
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1994 ZJ 
 
Join Date: May 2010
Location: Marquette, Michigan
Posts: 541
Need help battery dying.

Well this is my situation. My battery gets really low to the point where the jeep barely starts or it goes completely dead over night. I went to oreilly had the battery and alternator tested, the results were Voltage was ok, diodes ok and amperage output was 40 amps with everything off at idle. I also performed a parasitic draw test and got 1.5 mA. Now I'm just kind of lost on what would be happening can anyone point me in a general direction? Oh my battery is 800cca.

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Quote - I currently have this set up with some ok shocks. Mine rides stiff but its not completely unbearable. My rear end is what kills me more than anything. Signed - Okie_Rider
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Unread 05-06-2013, 07:40 PM   #2
durango-bob
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You can disconnect the battery overnight and see if it is OK in the morning. That would determine if you have a battery issue or an off draw issue.
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Unread 05-07-2013, 12:15 AM   #3
bullydog22
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1995 ZJ 
 
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Sounds like parasitic draw.
-Pull the negative battery cable and run your digital voltage meter on amps between the negative post on the battery and the negative bat. cable end.
-Observe and note the reading
-pull one fuse at a time until you see the reading drop. If you pull one fuse and it does not drop, put it back and and move to the next.
- once you find the fuse that makes the reading drop, you can determine which components are on that circuit and start testing/ replacing them.
GL
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Unread 05-07-2013, 02:33 PM   #4
stormer1092
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Quote:
Originally Posted by bullydog22 View Post
Sounds like parasitic draw.
-Pull the negative battery cable and run your digital voltage meter on amps between the negative post on the battery and the negative bat. cable end.
-Observe and note the reading
-pull one fuse at a time until you see the reading drop. If you pull one fuse and it does not drop, put it back and and move to the next.
- once you find the fuse that makes the reading drop, you can determine which components are on that circuit and start testing/ replacing them.
GL
already did that. 1.5 mA
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Quote - I currently have this set up with some ok shocks. Mine rides stiff but its not completely unbearable. My rear end is what kills me more than anything. Signed - Okie_Rider
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Unread 05-07-2013, 02:43 PM   #5
JeepNicholson
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Quote:
Originally Posted by stormer1092 View Post

already did that. 1.5 mA
So which fuse stopped the draw when you pulled it?
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Unread 05-07-2013, 02:47 PM   #6
stormer1092
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Quote:
Originally Posted by JeepNicholson View Post
So which fuse stopped the draw when you pulled it?
1.5 mA is within acceptable range. I believe.
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Quote - I currently have this set up with some ok shocks. Mine rides stiff but its not completely unbearable. My rear end is what kills me more than anything. Signed - Okie_Rider
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Unread 05-07-2013, 04:11 PM   #7
JeepNicholson
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Quote:
Originally Posted by stormer1092 View Post

1.5 mA is within acceptable range. I believe.
Oh right, sorry, misunderstood you there.
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Unread 05-07-2013, 04:16 PM   #8
elf517
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Mine does the same thing. My driver door is a little bit off and it doesn't close properly so the interior lights sometimes come back on after i walk away from it and they drain the battery.
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Unread 05-07-2013, 04:17 PM   #9
tucsonzj
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Quote:
Originally Posted by elf517 View Post
Mine does the same thing. My driver door is a little bit off and it doesn't close properly so the interior lights sometimes come back on after i walk away from it and they drain the battery.
I was thinking hidden interior light, or possible random draw from audio system after turn off?
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Unread 05-07-2013, 04:20 PM   #10
elf517
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Well I don't know about the aftermarket audio system I have had my sony xplode and my subs in long before it became an issue.
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Unread 05-07-2013, 06:29 PM   #11
durango-bob
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Quote:
Originally Posted by durango-bob View Post
You can disconnect the battery overnight and see if it is OK in the morning. That would determine if you have a battery issue or an off draw issue.
How did this test work out?
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Unread 05-08-2013, 01:12 AM   #12
bullydog22
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Something is wrong in your diag. You say batt., alt , parasitic draw all test good , yet you still have a dead batt. in the morning? Cant be.
A draw over about .06 amps can kill a batt. over night. What did you have your DVOM set to when you tested draw? If you have access to, try testing the batt. with a load tester. I've had bad batt. test good with cheap conventional testers like AUTO ZONE uses.
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Unread 05-08-2013, 02:11 AM   #13
Oldfrog
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Install the battery, start it up. Now take a digital volt meter and measure the voltage across the Battery terminals ( not the cable clamps, but the battery's terminals). ( 13.5v or better, is about right, as I recall. I think mine is around 14.XX...but 13.5 is probably Ok)

Next, take a reading across the battery cable clamps. The readings should be EXACTLY the same, if the engine is running and you're making good contact with the meter probes each time. If not....then you've begun to isolate your problem.

FYI :
Jeeps hate bad or aging batteries. If it's over 2 years old, you probably need to replace it anyway.
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Unread 05-08-2013, 10:28 AM   #14
tucsonzj
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Quote:
Originally Posted by Oldfrog View Post
Install the battery, start it up. Now take a digital volt meter and measure the voltage across the Battery terminals ( not the cable clamps, but the battery's terminals). ( 13.5v or better, is about right, as I recall. I think mine is around 14.XX...but 13.5 is probably Ok)

Next, take a reading across the battery cable clamps. The readings should be EXACTLY the same, if the engine is running and you're making good contact with the meter probes each time. If not....then you've begun to isolate your problem.

FYI :
Jeeps hate bad or aging batteries. If it's over 2 years old, you probably need to replace it anyway.
Not to mention, when one goes wrong all goes wrong.
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Unread 05-08-2013, 11:36 AM   #15
stormer1092
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Location: Marquette, Michigan
Posts: 541
I don't know what was going on with this. The last 2 days everything has been running fine. Maybe some light was left on or the brake lights stuck on or something and I just didn't notice. If it happens again I will update.
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Quote - I currently have this set up with some ok shocks. Mine rides stiff but its not completely unbearable. My rear end is what kills me more than anything. Signed - Okie_Rider
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