battery drains overnight? -
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Unread 03-28-2013, 01:01 PM   #1
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1970 FSJ Wagoneer 
Join Date: Mar 2013
Location: Groton, Vt
Posts: 24
battery drains overnight?

need some help here....I have a 1970 wagoneer, put in a new battery and it is being drained within 24 hours. All things function properly. How do I go about figuring out what is draining the battery?

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Unread 03-28-2013, 01:28 PM   #2
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1975 CJ6 
Join Date: Dec 2012
Location: Medford, MA
Posts: 463
Use your multimeter to measure the number of amps between the battery cable and the battery. Then start removing fuses until the current drain stops. You can also disconnect the alternator and the regulator to see if that stops the drain. Once you broadly localize the drain, you can start refining your search to a smaller and smaller segment of the wiring harness. A '70 does have some fuses - they are inline with the wiring harness.

It helps to refer to the wiring diagram - - the wiring in a '70 is simple by modern standards, but unfortunately there is no color code. I suggest you enlarge the diagram with a photocopier and start tracing out your circuits with color pencils. Be patient and systematic, and you will find the problem.

The '72 harness is similar to the '70. Look at it too, since it is shown in picture form. It may help you to locate things.
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Unread 03-28-2013, 02:46 PM   #3
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1999 WJ 
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Location: Austin, TX
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Just another thought.... 1 more thing you might try is disconnecting the battery overnight and see if when you re-connect in the morning if it cranks. If its dead even without being connected then one of the cells has gone bad and its internally shorted. Will drain slowly overnight but as long as you start it multiple times a day it will turn over.
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Unread 03-29-2013, 10:18 AM   #4
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1970 FSJ Wagoneer 
Join Date: Mar 2013
Location: Groton, Vt
Posts: 24
thanks for the advice and i'll let you know what i find.
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