battery won't stay charged
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New User
Joined: Sep 2002
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battery won't stay charged
I can't seem to keep the battery charged in my 90' Ford Ranger. I've got a brand new battery and had the alternator checked and they said that was fine. I'll drive it around for about a half hour and if it sits for a day it won't start. I guess something is draining the battery, but for what and where do I look? Some help would be appreciated. Thanks.
Elder User
Joined: May 2002
Posts: 818
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From: northeastern ohio
battery won't stay charged
[updated:LAST EDITED ON 11-Sep-02 AT 11:35 PM (EST)]You might have a light on somewhere. Maybe in the glove box or something, thats what it was on my old car. perhaps something similar. You can check by getting an amp meter and pulling the fuses from the fuse box and use the amp meter to see if there is any current draw. when you find what fuse it is.. you will have an idea if something has a short in it. It could also be a wire somewhere in the truck grounding to the frame.
NOTE: on some fuses there will be a small draw.. ex clock on radio etc. Oh and just pull the fuses one at a time if you are going to do it that way you dont get em confused.
NOTE: on some fuses there will be a small draw.. ex clock on radio etc. Oh and just pull the fuses one at a time if you are going to do it that way you dont get em confused.
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
battery won't stay charged
Just a little more, you connect the amp meter by disconnecting the neg battery cable and putting the amp meter in line there, don't try to start the truck with it there.
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Junior User
Joined: Dec 2001
Posts: 58
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From: Moscow PA
battery won't stay charged
Disconnevct the output wire from yhe altenator and see if the battery still dies after sitting for the same period of time. If it does not die, your altenator is the cause. A bad diode will current drain back to the altenator and drain the bat,. Perhaps they did not do a diode test when they checked your alt.
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