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Question edited for clarity, add maker.
Question moved to model category.
The best idea is to NEVER disconnect a car battery because you lose all the programming. Leave it connected to a Battery Tender. It safely supplies a small trickle charge to keep the battery are 12 volts. You can even connect it to a mechanical timer to turn on for one hour per day or per week. I use one for my boat batteries. I put it on overnight once a month. If it is outside, put a solar charger on the dash.
You need an auto electrician to reprogram everything, It is a quick job, no longer than 45 minutes to an hour.
the car as a wire connected to the chassis and he is descharging the battery. you have to go to a car electrician and look wall the cables to see where he is not isolated.
You'll have to put a volmeter on the battery when the engine is running. The voltmeter should read between 14 and 14.5 volts. If not the alternator is not charging. Could be a defective alternator or a wiring problem.
Drive your car to Auto zone and have them check your alternator, it is a free service, they can tell you if it is bad or not..Check the plug that snaps into the alternator,your wire connections might need to be cleaned. You can clean them with a small fingernail file..I have a taurus and I had that same problem..unplug the connector and file the wire side and the alternator side connection...
sounds like your starter motor is at fault.I have had this problem before and found the starter was draining the battery due to a short in the windings of the motor.
Your battery is either faulty or ther is a parasitic drain, have it checked out at parts house. With a good battery installed, spray some starter fluid into intake housing. If it starts, then dies, you have fuel pressure/delivery problems. Can you hear the fuel pump run when you turn on the key? Hope this helps.
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