Question about 1999 Ford Taurus

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Electrical Demon in my 1999 Taurus SHO

A couple weeks ago the dome light in my 1999 taurus sho wouldnt go off so I sprayed CRC in the door latches, opened and closed them a handful of times and it took care of that problem. Now last night I had the drivers side headlight go out and went in to replace it. That is a tight fit to get your hand in there, but next to the battery is a black box that I moved out of the way to gain access. While jiggling the light to remove it, it came back on so I did not replace.I put the box back and continued to drive home, 10 minutes later the lights got super bright,the radio and climate control seemed to get a mind of their own.At idle the battery light goes off but as soon as you accellerate it comes back on.I just went out to test the alt. with a volt meter and the car is completely dead.I don't know if this is the battery ,alternator, voltage regulator or some other electrical demon.Also on this vehicle is the voltage reg. inside the alt? any help would be appreciated.

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Could be a bad diode in the alternator. make sure the car is off with batery conected and charged. need a test light and jumper cable and digital multimeter. disconect only the negative cable conect one end of test light to batery cable and the other end to batery terminal.if the amp draw is higher than 4 amps it will light up.now conect the multimeter to the neg batery cable with red probe and black probe to neg batery terminal . multi meter on (dc 10a) if it reads between 0.8amps and 1.5amps a light is on or a relay is stuck. to check relays use a old wll charger (phonecharger) cut ends of and connect one wire to 85 and other to 86 on realy it should click. now use the multimeter select continuity and see if it beeps. if it does it works. now remove the phonecharger. and reconet the multi meter to 30 and 87 on relay it should not beep. buy a multi meter from wall mart (innova ) for $30

Posted on Mar 24, 2010

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