Question about 1994 Mercury Cougar

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Dead battery overnight

I acquired a 94 Mercury Cougar that has some problems. The one that has escaped me thus far is an electrical draw somewhere in the lighting circuit. What could this be?

Posted by robertames on


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Bad ground somewhere in the lights causing back feed

Posted on Oct 06, 2008


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1986 mercury cougar battery, keeps being drained and it's a new battery.

You either have a faulty alternator or there is a constant power drain on the battery when the car is switched off as a result of a fault in the electrical system.
1. Alternator
If i it is not charging fully as designed the only other source of power whilst you are running the car is the battery. Thus the battery will drain.

2. Slow power drain.
This will occur when the car is idle such as overnight. In this case, power is continually being delivered to a system on the car which is meant to be inactive due to a fault with the electrics. This can run the battery down so low the starter motor will not kick over when you try and start the car.

You need to get the car to a competent mechanic for tests so he can identify the cause and rectify it. For example if the old alternator is faulty and will not deliver sufficient charge to run the vehicle you will need to install a new one.

May 18, 2015 | Mercury Cars & Trucks

1 Answer

Battery dies and there is no draw on it

Technically the power has to be going somewhere.
Either the battery has a dead cell, or you have a bad connection at the main cables, or you do in fact have a slight current draw.
If you disconnect the battery cable, does it still go dead overnight ?

Apr 15, 2013 | 2005 Jeep Grand Cherokee

1 Answer

94 cougar check engine light on sometimes. throttel responce eratic

problem in the engine somewhere. check the oil make sure not cloudy and the plugs also

Oct 22, 2012 | 1994 Mercury Cougar

1 Answer

2000 Mercury Grand Marquis battery drains overnight. Have replaced the battery and checked the altenator. Help!

Your dome light may be staying on. Manually turn it off for a night, see if that helps. You definately have a slow draw somewhere.

Sep 15, 2012 | 1992 Mercury Grand Marquis

1 Answer


sounds like the voltage regulator on the altenator cable or the cable running from battery to altenator shorting a bit.

Jun 07, 2012 | 2000 Mercury Cougar

2 Answers

The alternator in my 94 cougar stops working not charging . replaced it several times, replaced battery, and replaced connector

do you have a high power boom box for a radio? if so get a rid of it for these blow out altenators quickly

Feb 14, 2010 | 1994 Mercury Cougar

1 Answer

94 Mercury Cougar. Was told that Tranny is in

Unplugging battery wont resolve this issue. I bet theres a code in there somewhere. I have the same problem with my voyager and replaced everything under the sun to no avail

Jun 06, 2009 | 2000 Plymouth Voyager

1 Answer

High engine idle 94 Mercury Cougar

replace throttle body gasket. first check to see if carbon has built up around the throttle valves in throttle body if so remove and clean it with throttle body cleaner.and a old tooth brush. besure to remove all electrical components or any thing that plastic or rubber the cleaner will destroy it.

May 18, 2009 | 1994 Mercury Cougar

2 Answers


Check for bad relays, that get stuck. Some fuel pump relays get stuck also. Make sure nothing is left on such as any lights , etc. Your alternatopr could be bad too.

Oct 22, 2008 | 1999 Mercury Cougar

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