Question about 1987 Mercury Grand Marquis
This car has always ran good. I have new spark plugs and wires.
Posted on Jan 07, 2014
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Posted on Jan 02, 2017
SOURCE: My battery light is showing
Here is a procedure to isolate a battery drain I found elsewhere and has already proved very useful several times.
Remove negative battery cable from the battery. Using a 12-volt test light, hook one end to the negative battery post the other end to the negative battery cable you just disconnected. The test light will glow or “light” if there is a drain. If the “light or glow” is faint, that is probably normal draw for the clock or computer. If the “light or glow” is bright, then there is a large drain. That should be corrected. Now start removing and replacing the fuses one by one until the light goes out; that one will be the circuit with the drain. ***Remember to hold in the button in the door jam for the interior lights.***
Posted on Jul 22, 2008
there can be electrical issues like lose wiring..check all the wiring.. there are not many reasons because of which a battery drains out..
Posted on Dec 28, 2010
You may have a drain on the battery as well as trying to start the engine. You could try jumping a feed to the starter solenoid and see if it is more willing than usual. If it is - find the short. If not, it could be time for a new starter solenoid. They do get worn and covered in soot internally, and therefore make poor connection.
Posted on Dec 26, 2008
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