Battery is drained - 2004 Ford F250

if 2 battery cables on positive make sure not corroded in between see if you can move up and down should be tight

the following links will help with a parasite drain
How to do Parasitic Battery Drain Test How to Stop Car Battery Drains Testing Your Battery for Parasitic Load Parasitic Drain Yahoo Video Search Results

What make , model an year vehicle ! What theft light ? on the instrument cluster , on top of dash pad etc.... Normally these don't pull enough currant to drain the battery .

have battery and alternator tested most auto stores offer this service for free -if good the following showes how to look for a parasite drain
How to Test and Find Parasitic Battery Drain Key Off How to Find Parasitic Battery Drain

you may have a short circuit in the system seek auto electriction

HELP 2000 Z3 Battery Drain - Bimmerfest - BMW Forums

www.bimmerfest.com > ... > Z Series > E36/7 Z3 (1996-2002)

Feb 18, 2007 - 7 posts - ‎6 authors
HELP 2000 Z3 Battery Drain E36/7 Z3 (1996-2002) ... Something is draining the battery. ... Posts: 55. Mein Auto: 2000 BMW Z3 2.8 Roadster. z3 1.9 battery drain (fuse 31)
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Seen this "mystery drain" many times. Check spark at the battery to see how big the drain is. For this simple test, blow away any (explosive) battery charging fumes. Leave one terminal on and gently touch the other to its post in fairly dark surroundings. Then try it again with the wires taken off the alternator. Your spark is now probably much less. Usually bad diodes leaking electricity backwards through the alternator cause this drain. Replace the alternator or the diode pack inside it. Some mechanics recommend actually measuring the drain.... hahaha. OK whatever.

The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
Also,do an overnight battery check by disconnecting the battery overnight,if things are fine the next morning after the battery was disconnected then it is a drain in the vehicle,if the battery is dead even after being disconnected overnight,,then the battery is bad.

WHEN TURN OFF CAR CHECK TO SEE IF RADIO TURN OFF.CHECK TO SEE IF INTERIOR LIGHTS OFF.MAKE SURE HEADLIGHTS TURN OFF.IF ALL LOOK GOOD.YOUR POWER DOOR LOCK FAULTY DRAIN POWER.FAULTY BLOWER MOTOR RELAY DRAIN BATTERY.FAULTY STARTER RELAY OR SOLENOID DRAIN BATTERY.FAULT IN THE PCM WILL DRAIN BATTERY.MANY MANY THINGS WILL DRAIN BATTERY.