Question about 2000 Lincoln Town Car

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I have a 1992 lincoln towncar signature series that keeps drining battery what could it be ive had it in several times relay switches changed

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It can be ANYTHING, but I suggest a battery draw test.
Map and pull all of your fuses, disconnect the negative terminal, and put a test light or voltmeter in series with the terminal and cable. if the light lights or voltage over .5 or so, something is draining. Now you disconnect things, starting with the alternator, and retest.

if no light or voltage, start putting back fuses one at a time. Put the interior light fuse back in LAST or get false reading every time the door is opened, which is often, during this process.

Most common, diodes in the alternator. Without a scope, or disassembly you can get okay test results, but not an indication of failure. if you disconnect it and test as described above, you can tell if it is draining your power. If so, it also will barely charge.

Another issue is a battery failure, so externally recharge that. If a battery goes totally dead, typically they fail to give satisfactory service and need to be replaced, as well, if the fluid in it goes below the tops of the plates, that is usually all she wrote for the battery.
You always need a good battery.

Posted on Oct 13, 2010


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