Question about 1992 Ford F250

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Battery drains in a few days.

I have an electrical short somewhere because the battery drains over a few days. When I put a test light in line with the negative, the light stays on with a faint pulse. When I pull fuse #13 (Stop/hazard; Anti-lock brake; memory/power; Speed control; Stop sense for :Electronic Engine control; Anti lock brakes) the test light will go out after a few seconds. I don't know what the stop sense is or what "speed control" is? I have the anti locks disconnected and steering column torn apart. What is "memory/power"? Seems like a capacitor of some kind hold a charge. Once I turn key back on then off, my test light stays on and pulses until I pull out fuse again. When I hook up battery it arcs. New alt and key switch. Can U Help????

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Disconnect the pos while running- if it still runs the alternator is working to run it. If not get the alt diodes tested, it is possible it is causing a drain while sitting. If it is working, check to see if it is overcharging because that can cause the battery to break down- "sulphate"' the plates and cause an internal short that will drive you crazy trying to find the short in an automobile component. If you just make short trips you could just be not charging it enough do deep cycle it. Have the batt tested- its usually free after all. In my part of the country I've never seen a modern 8yr batt last longer than 3 1/2 years, so don't assume it's good.

Another problem is you might have an internal short

Posted on May 14, 2009

  • Annimater
    Annimater May 14, 2009

    Forgot to mention ECM clock and eprom use a little bit of juice to keep memory so that you won't run in open-loop mode when you first start your vehicle. Most cars can reset & clear codes by disconnecting the batt.- because it cuts off the power to the memory. Radio with LED clock does the same. It might even be enough to cause a small spark but a millivolt drain is normal and will take months to drain a healthy battery. Clean your battery too it can discharge from a dirty top.



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    Annimater May 20, 2009

    Alternator "Diode." Unless Ford has a different name for theirs.

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Usually what happens when the alternator has a faulty "conductor" i think its called;)
http://autoforum.classifieds1000.com/Ford-F250/electrical_short

Posted on Nov 07, 2008

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