Mechanics Stumped - Unfused battery drain - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Mechanics Stumped - Unfused battery drain

Rockridge 4WD IS Taking Zone Offroad Suspension Lift Kits ZONE 4.25" combo lift for TJ available at Rockridge4wG2 Disc Brake Conversion Kit for Jeep Wrangler YJ TJ LJ Ch

Reply
Unread 12-05-2012, 10:26 PM   #1
imjohnm
Registered User
1996 ZJ 
 
Join Date: Mar 2012
Location: Santa Barbara, CA
Posts: 14
Mechanics Stumped - Unfused battery drain

140 ma drain even with all fuses out & hot alternator lead unhooked. No alarm, amp or bootleg wires visible. Any ideas? 96 4.0 4wd Laredo

imjohnm is offline   Reply With Quote Quick reply to this message
Unread 12-05-2012, 11:05 PM   #2
phitmein
Web Wheeler
 
phitmein's Avatar
1995 ZJ 
 
Join Date: Feb 2009
Location: Columbia, SC
Posts: 2,334
have you had your battery load tested yet ?
phitmein is offline   Reply With Quote Quick reply to this message
Unread 12-05-2012, 11:54 PM   #3
imjohnm
Registered User
1996 ZJ 
 
Join Date: Mar 2012
Location: Santa Barbara, CA
Posts: 14
Yep, tests good.
Thanks.
imjohnm is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 01:16 AM   #4
jnicewan
Registered User
1995 ZJ 
 
Join Date: Dec 2010
Location: Norman, OK
Posts: 2,076
Did you pull the relays and circuit breakers too? The draw has to be coming from somewhere, you have not disconnected everything if you are seeing a 140mA draw. Never seen one but I guess its possible that the starter motor has a draw since its directly wired to the battery. I would be happy to see the draw fall below 50mA but usually less than half that is the norm.
jnicewan is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 01:47 AM   #5
KoreaZJ
Registered User
1994 ZJ 
 
Join Date: Aug 2011
Location: GANGNAM STYLE
Posts: 2,666
Pulling PDC fuses isolates most everything. You disconnected the alternator, so that leaves only PDC housing and starter still connected? Disconnect battery feed cable from PDC to separate it from starter.
KoreaZJ is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 03:12 AM   #6
phitmein
Web Wheeler
 
phitmein's Avatar
1995 ZJ 
 
Join Date: Feb 2009
Location: Columbia, SC
Posts: 2,334
If a parts store did the test I wouldn't trust what they said because I have seen them be wrong more than once.

I have a load tester and do it myself.

The last battery I had that was driving me nuts I didn't have my load tester handy so I charged my battery all the way and took off the positive cable for three days then put it back on and it was too weak to turn it over.

Dead cell I think.

If it is not your DD you might want to try that.

Phit
phitmein is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 07:54 AM   #7
chucktownzj
Registered User
1998 ZJ 
 
Join Date: Oct 2012
Location: Charleston, sc
Posts: 36
When they tested your battery did they load test it. A lot of times parts stores hook them up to computerized testers that do not catch a bad cell. Sometimes the best test is a load tester. 10sec full load, should not drop much below 10v.
chucktownzj is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 10:04 AM   #8
imjohnm
Registered User
1996 ZJ 
 
Join Date: Mar 2012
Location: Santa Barbara, CA
Posts: 14
Sears did a 10 second load test and I pulled every PDC use and relay one by one plus the alternator red lead, but the drain just hangs in there. I've been working with the ground side off the battery and removing it when I leave the car for a few hours. This really impresses a hot date and the super wealthy. Next I'll try disconnecting the lead to the starter solenoid, but I'm wondering if I should be working from the hot side of the battery.

Thanks guys for all the help. Logic and persistence will prevail.
imjohnm is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 10:13 AM   #9
cliffordmck72
Registered User
1994 ZJ 
 
Join Date: Nov 2007
Location: Lodi, CA
Posts: 72
It doesn't matter what side you hook it up on, as long as the meter is in series. Battery disconnected, Cable to meter lead and battery to other meter lead.
If you're lost I suggest starting with the larger feeds as suggested above, once you find the big one work your way trough that circuit using the wiring diagram.
cliffordmck72 is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 10:26 AM   #10
chucktownzj
Registered User
1998 ZJ 
 
Join Date: Oct 2012
Location: Charleston, sc
Posts: 36
Do you have a digital voltmeter? Take the negitive terminal off the battery. Connect the red wire on the meter to your neg. battery contection. Connect the black wire to the neg. post on the battery. Set your meter to 10A. Make sure the red meter wire is pluged into the 10A slot on the meter and the black lead in the neg.. This should complete your circuit and give you draw amps. Make sure the doors are closed(interior lamps off) and nothing in the cig lighter. Do not turn anything on(will blow meters internal fuse). At this put you can start undoing stuff. Undo your starter and see if the draw goes away. Unhook you fuse box from main connection. If all is unplugged and still showing a draw then your doing something wrong.
chucktownzj is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 12:56 PM   #11
imjohnm
Registered User
1996 ZJ 
 
Join Date: Mar 2012
Location: Santa Barbara, CA
Posts: 14
I have an analog meter that shows a consistent draw even with the PDC lead off. Next the starter.
imjohnm is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 01:18 PM   #12
chucktownzj
Registered User
1998 ZJ 
 
Join Date: Oct 2012
Location: Charleston, sc
Posts: 36
Quote:
Originally Posted by imjohnm View Post
I have an analog meter that shows a consistent draw even with the PDC lead off. Next the starter.
I would see if you can get (borrow) a digital meter to double check yourself. Analog meters create there own voltage (not for amp testing) to test and are not the best to use in an automotive environment.
chucktownzj is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 03:33 PM   #13
cmax72ms
Registered User
1998 ZJ 
 
Join Date: Sep 2012
Location: Conroe, Texas
Posts: 22
Go to a marine store and get a battery disconnect switch. Mine works great
cmax72ms is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 06:49 PM   #14
phitmein
Web Wheeler
 
phitmein's Avatar
1995 ZJ 
 
Join Date: Feb 2009
Location: Columbia, SC
Posts: 2,334
cmax you beat me to it and you can get them from RV supply places too I think.
phitmein is offline   Reply With Quote Quick reply to this message
Unread 12-06-2012, 09:37 PM   #15
imjohnm
Registered User
1996 ZJ 
 
Join Date: Mar 2012
Location: Santa Barbara, CA
Posts: 14
Aha - borrowed a digital multimeter and going through the fuses again found that pulling the 50 amp fuse stops the drain. Have to get a diagram to see what is on that circuit. The 180 ma drain is there even with the alternator and solenoid wires removed, but stops when the PDC wires removed or the 50 amp fuse.
imjohnm is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.