2000 expedition is killing the battery with ignition off

2000 FORD EXPEDITION
130,000 MILES
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LEVIJ
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I had replaced a coil pack that fires one of my cylinders. The fuel line that is connected to the fuel injectors had to be removed to get to this particular one. I replaced the O-rings on the injectors, put everything back together including the vacuum lines I paid special attention too. The first test run, my brake pedal was very hard to press and the engine seemed to still be missing. The second run the brakes are fine, haven't seen a light yet, but still missing and the warning sound (ding-ding-ding) is sounding very rapidly after I turn ignition off and keys out. The battery is dead after a few hours.
Apr 20, 2012 at 8:12 PM
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FIXITMR
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so this only started happening after you changed coil?
Apr 20, 2012 at 10:18 PM
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LEVIJ
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Yes, I really didnt change the coil but had to re-tap the bolt connection because the last person that changed it (before I baught it) stripped it out. I just replaced the same one.
Apr 21, 2012 at 7:11 PM
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FIXITMR
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did you disconnect battery while doing work?
Apr 21, 2012 at 7:40 PM
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LEVIJ
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I was afraid you would ask that. I did not........... Do you have bad news?
Apr 23, 2012 at 1:59 AM
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