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Something is staying on and draining your battery. It is common for all of those things to happen when the battery gets low. Those things are all controlled by the body computer, which will do all kinds of crazy things (including set-off the theft alarm - honking horn, flashing lights, locking and unlocking doors, etc.) when the battery gets low.
You need to have your vehicle tested for what is called an "Ignition-Off Draw" it may be something as simple as a glove box light staying on or a vanity mirror light in the sun visor that is not turning off properly. It could also be something considerably harder to pinpoint like a relay that has sticking contacts. A competent auto repair technician should be able to determine at least which main circuit is causing the problem within an hour. (There may be further diagnosis/vehicle disassembly involved in actually fixing the problem, but within an hour, they should have a pretty good idea of what needs to be fixed.)
You need to check for something that is a constant drain on the battery.
Is the underhood light staying on?
Are the interior lights left on?
Is the glove box light staying on?
Has anything been added to the van recently like an alarm, radio, amplifier, etc?
Do you leave your GPS unit plugged in or cell phone charger plugged in?
I would start my search (since you have already had the alt output checked) looking for something that is draining the battery slowly.
what i think is you problem is the device attached the one door latch and need to be replaced for a new one,you can get them from the dealership and the are not expensive,this device is the one turn your lights on(interior) when you open de doors
you have a voltage drop.fine the damaged wire going fro mthe positive terminal of your battery to your alternator.fix this or it will keep working the alternator and draining your battery.
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