Incipient battery drain

[larryswanson]

My M38A1 Jeep has a small electrical drain even with everything off. I see no lights on etc. I understand that the starter switch or the headlight switch sometimes cause this. Does anyone know of any other likely culprits?
Larryswanson

[oilleaker1]

The 24 volt regulator has a capacitor inside that will discharge and show a small spark at the battery cable when connecting the cable. If you put a test light between the disconnected + cable and positive post and it lights up, you have a short in the system. Sometimes a alternator can have a bad diode going to ground which will do this. If you do have a light on, disconnect power leads going to each circuit, one at a time, and watch the light. When it goes out, you found the one to look into. John

[skyjeep50]

If you do a "search" for other posts dealing with battery drain you can come up with some other ideas of what to check. Here is one post of interest:

http://www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=7641&highlight=currant+drain

I've also read that people have had shorts develop in the ignition switches. Test each circuit and you will find the culprit.
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1951 M38

[BCA]

Carbon build-up in the starter switch can cause a power drain. A battery kill switch, located where it is handy to use, is a good safety feature as well as a solution to current drain when parked. .. Brian

[Hawkshadow]

Check your batteries to see if they are "see-saw" draining. I forget the term right now but if they aren't paired one will drop to charge the other, which will in turn try to re-charge the first once it's higher and the see-saw goes back and forth slowly draining the batteries.
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Jordan

M38 CDN
52-30718

[wesk]

It's called chasing and happens when the capacitance of the two batteries differs significantly usually due to a variance in age or unequal loading as is often the case when folks try to tap 12 volt off of only one battery for a 12 volt accessory. If you are one of those folks try alternating which battery you make the tap on.

Troubleshooting is really very simple. Disconnect +24 cable or the ground cable that bolts to ground and place a test lamp in series between the battery and the disconnected cable. If that lamp glows you have a short or power loss to ground. Then you disconnect one circuit at a time until the lamp goes out and you have found the offending circuit.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php