Question about 2000 Lincoln Town Car

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Battery Drain. This will be the 3rd battery in 10 years. What is the cause?

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  • Lincoln Master
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There are 2 things I can write to clear this problem up for you.

First, to diagnose a Battery drain you need to shut everything off in the car including the clock fuse and the alarm fuse. Then disconnect the Battery and connect an OHMmeter to the 2 loose Battery cables. The OHMmeter will show the amount of Drain in the system by moving the needle on the OHMmeter. You disconnect 1 fuse at a time and see if the needle drops on the meter. Then reconnect that fuse and move on. Once you find the fuse that is connecting when it should be OFF, you can trace the short for that group of wires that fuse controls.

Second, you need to drive far enough for the Battery to recharge. If you use your headlights or Rear Window Defrost, you will need to drive farther to replenish the power drain.

Autozone and Oreillys will scan your vehicle for free. You need to emphasize the need for Alternator output and Starter draw results.
Buy the strongest Batteries you can get when you need your next one. I like the Max at Walmart, 3 Year free replacement, Nationwide service, and reasonably priced for what you get. Everybody has an opinion about batteries and I can only say what I use in my vehicles.

Good Luck with your Lincoln and I hope you are happy with my help.

Posted on Jul 14, 2010

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3 Answers

What is the most battery draining part when car sits over night


hi Larue.
You're late for work and rush out to your car, only to find that it won't start. The headlights are dim and the engine simply refuses to turn over. You realize that your battery is dead. But how did this happen? There are five main causes of car battery drain or failure.

Human error

You've probably done this at least once in your life - you come home from work, tired and not really thinking, and left the headlights on or didn't completely close the trunk. Overnight the battery drains, and in the morning your car won't start. Many new cars alert you if you've left your lights on, but may not have alerts for other components.

Parasitic drain

Parasitic drain is due to components in your vehicle continuing to run after the key is turned off. Some parasitic drain is normal - your battery delivers enough energy to keep things, like your clock, radio presets, and security alarm operational at all times. However, if there's an electrical problem, parasitic drain can exceed what's normal and deplete the battery.

Bad charging

If your charging system isn't working properly, your car battery can drain even while you're driving. Many cars power their lights, radio, and other systems from the alternator, which can make the battery drain worse if there's a charging problem. Then you'll be stranded at roadside with a stalled car that needs a boost. And even then, bad charging will drain your car's battery. A professional mechanic will be able to diagnose what's causing a charging problem.

Defective alternator diode

A car alternator recharges the battery and powers certain electrical systems. If your alternator has a bad diode, your battery can drain. The bad diode can cause the circuit to charge even when the engine is shut off, and you end up in the morning with a car that won't start.

Old battery

If your battery is old, it might not hold a full charge. If your car consistently won't start, it's possible that the battery is worn out. You should generally replace your car battery every 4-5 years. If your car isn't starting consistently, and your battery is old, battery replacement should be the first thing you consider.
Having a battery that won't hold a charge is frustrating, and figuring out what's causing the problem can be tricky. Assuming that the cause of the battery drain is not human error, you will need the assistance of a qualified mechanic who can diagnose your car's electrical problemsand determine if it is the battery or something else in the electrical system.
you can read up some more at this link.

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'04 Chrysler Pacifica battery won't hold a charge for long. Sometimes it will be fine for months and then not start. Other times it won't last more than a day. I was thinking it must be a parasitic drain...


First try to understand if there is a parasitic drain.

Once you exclude the drain, replace the battery, a battery with shorted cells can cause the drain.


The firmware has nothing to do with drainage, unless the unit is factory defective.

To measure drainage remove ignition key, connect the amp meter between the battery positive wire connector and positive terminal.A couple of milliamps drainage is normal, and is caused by instruments, car stereo memory, ECU etc.
Start removing more fuses , and open the wiring at different points , trying to locate the problem.
Remove the fuses and see if you have drain by connecting a meter to read amps on battery, if you have drain with no fuse, then the problem is insulated to wiring harness before the fuse, with something shorted between the battery and the fuseblock.
Also check car stereo and car amp HU, the HU can keep a unit on when the ignition key is off, causing drain.


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