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Im having major problems that even my mechanics cant figure out. My car will turn on fine, but once I drive it around for like 5 or so min over 30 it slowy comes to a complete stop. The battery light will come on. The battery got cleaned and is fully charging. And the alternator is new. My mechanic checked out the wiring and nothing seemed loose. It's a 99 mercury cougar

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1. check the ground cable to the battery and the chassis.
2.Check the alternator again for a possible weak diode array.
3. check the computer to see if it is giving proper voltage for system check for the
battery check.
this may take a mechanic to check this.
4. If battery is over 4 year old it may need to be replaced ( dead cell in battery or weak)
will not hold charge. If battery is a sealed battery this may be the cause.
5. check all grounds to the fuse box to see if you have proper ground potential that is
you will need to have ohm readings that do not fluctuate.
6. If you have installed any components such as new cds,dvd units, speakers, tachometer
check for proper ground seating.

Posted on Oct 05, 2010


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