Question about 2000 Mercury Cougar
I have the same car. Same problem. We replaced the fuse box and it fixed the problem. But here we are 6 months later and the problem came back. So for a quick fix you can replace the fuse box. I'll let you know what the real problem is when i get it to the dealer.
Posted on Jul 16, 2009
I suggest you take to auto-zone with a fresh charge on the battery, have then test to see if the alternator s putting out voltage , if not try full fielding the wire on the alternator and retest for power from alternator, if it does not charge then do like the other guy said run a positive wire straight from the battery to the output side of the wire on the alternator, then try running and do a voltage test if it's not producing 13.5 volts output then the alternator is defective, if it runs the battery down sitting overnight then the didode trio may have blown and the diode is allowing connection threw the armature going back to the battery, I am not sure if this model has a separate voltage regulator but if it does then you will have to test the voltage regulator, you will have to get a diagram for it and full field the regulator to see if it will charge correctly, when testing you need to have a volt meter connected to the battery to see if it gets 13.5 volts on each of these tests you do. (Warning) do not do this test with low battery as low voltage will cause a high amperage condition and can cause you to burn out computer and other devices, do not let the battery get below 11 volts. If the dash lights go dim it is indicative of low battery power try using a battery charger on low to keep the voltage up and see if the lights and dash dim or go out. If notthen it is a charging system issue after running these test let me know what you find and I will give you more ideals to test without just changing parts. It is imperitive you have a digital ohm meter so we can test diodes and not burn out other componets.
Posted on Jul 14, 2009
Check fuses alternator fuse ,charge fuse.also if that checks out look at the harness for back of alternator is it in bad shape? is there a large wire by it self bolted on the alternator? if so take a wire ,same size,and bolt it on with that wire and run it directley to the positive battery post this will charge battery for now on,but if u dont have a large wire bolted on alternator ,the larger wire that is pluged into the alternator is the same wire ,tie into this wire really good and do the same (run to battery positive post) make sure this plug in is good ,if not u can purchase this at the zone
Posted on Jul 04, 2009
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Posted on Jan 02, 2017
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