Question about 1999 Lincoln Navigator

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2000 Navigator - something draining on battery - goes dead

2000 Lincoln Navigator goes dead after sitting in driveway (not being driven or started/used for more than 4 days). something seems to be draining on the battery. We have had every part in the car replaced pretty much, and cost us tons of $ trying to find the root of the problem, such as:
-Security Module
-Various fuses, etc.
-They have checked radio, etc. to see if draining on battery

3+ dealers could not solve the issue. Still in unknown what is causing the issue.

Any advice would be helpful!

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  • krissypoo4 Jul 22, 2009

    Thanks guys for your input and ideas.

    Unfortunately I know very little/don't feel comfortable playing around with the fuses, etc. so there is not too much I could do myself. My husband is also not very good with cars/conversant on the ins and outs of cars either. The various dealers have put the car on the their various machines and found nothing draining on the battery significantly. Any small draws they replaced the parts and still problem has not been solved.



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Hellokrissypoo4...Your navigator has what is known as a parasitic battery drain...meaning, something in the vehicles system is not turning is the way i test for this, you will need a digitial multimeter to perform this test...when doing this test make sure that the dome light, under hood light, trunk light, etc. are OFF.

  1. Remove the negative side battery cable from the negative battery terminal.
  2. Attach an ammeter(this measures amperage) between the negative cable and the negative battery post. wait a few seconds to several minutes for the car to go into sleep mode. i.e. when you make the contact with the test light the cars computer systems "wake up" after a bit of time they will go to "sleep".
  3. If the ammeter is reading over 25-50 milliamps, something is using too much battery power.
  4. Go to the fuse panel(s) and remove fuses, one at a time. Pull the main fuses (higher amp ratings)last. Be sure to observe the ammeter after pulling each fuse.
  5. Watch for the ammeter to drop to acceptable drain. The fuse that reduces the drain is the draw. Consult the owners' manual or service manual to find what circuits are on that fuse.
  6. Check each device (circuit) on that fuse. Stop each lamp, heater, etc. to find the drain.
  7. Repeat steps 1&2 to test your repair. The ammeter will tell you exact numbers

  8. Some after-market alarm systems may make this test too long or loud to be worth the effort. If that's the case, seek professional help.
  9. In more and more models made after 2003 disconnecting the battery will reset the PCM requiring the modules to relearn. In certain cases this requires a factory scan tool. It is best to take such cars to either the dealer or a professional in auto electrical systems.
  10. Be careful working around the battery in a car
Good luck krissy..i hope this helps..please rate me a fixya.

Posted on Jul 22, 2009

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Hate to say it but best way to test that by sounds of it, is to make a note of all fuses, if not sure where they all belong after, and pull them all. Then take a 12 volt DC test light, remove battery + cable, and hook test light between battery cable end & + battery post. test light should be off. Start putting fuses back one at a time. If light comes on faint, it's a small draw (such as radio etc.) if it comes on bright, it's a good size draw. I usually take those ones back out & note it,(where it goes & what circuit it's for) Then I proceed with the rest etc. Now you have big draw narrowed down to certain circuits. Dealer or good repair shop should be able to do same without taking fuses all out by using a clamp on amp meter & removing fuses one at a time to narrow it down then isolate it. I know the test light method sounds tedious, but I've had to do it on Motorhomes that have 2 or 3 fuse panels and no one else could find the draw. I did.

Posted on Jul 22, 2009

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Make sure all your doors are closed. Our navigator has a fault somewhere and indicates one of the doors is open. its not noticeable usually during the day, but you could put your hand on the side light panels located at the bottom of the door. Usually, they will be hot to the touch. I read on another post that there may be corrosion on the wiring under the driver seat that may cause doors to appear ajar to the the vehicles electrical system.

Posted on Jun 25, 2010

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Navigator has no heat replaced thermostate still no heat what should i try next

Posted on Nov 27, 2009

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