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Old 11-12-2011, 01:25 PM
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Constant Battery Drain. Daily Driver Help!

1999 F250, 7.3, 4x4 Auto

If I let my truck sit for more than a few hours, it has kills both batteries. I disconnected both negative battery cables and put a volt meter between the driver's battery negative terminal and cable. The truck has a steady 11v-12v draw with ignition off, key out and doors shut. I pulled every single fuse under the hood and under the dash 1 at a time and didn't see any noticable difference (at most half a volt for keep alive memory and the like).

What would cause a steady 12v draw that isn't on a fused circuit? I already disconnected the alternator thinking maybe a diode went bad in it, but no luck.

Another strange symptom, might be related, might not. I can operate my power windows and radio even with the key out of the ignition. Occasionally the radio will literally turn itself on. The marker lights have turned themselves on a few times, too.

Please help. This is my daily driver and plow truck.
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Old 11-12-2011, 01:54 PM
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I think I am having a battery drain in my truck as well. But I dont think that you are testing for a battery drain properly. Some one correct me if im wrong but using a volt meter to test volts between the negative lead and negative terminal with the negative lead off the battery should read 12volts. You still have the hot hooked up so the test lead is completing the circut. Im pretty sure you need to use a DC clamp meter. I need to do the same with mine. I just need to get a meter. I would assume that your issue is in the window situation. In my truck I can use my power windows with the igniton off until i open the doors. I assume there is a relay that allows this. I would say maybe you have a stuck relay or something keeping your ignition on.
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