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Old 11-13-2012, 06:41 PM   #1 (permalink)
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Default HELP No Charge!

Hi, I'm new to the SHO scene but have worked on vehicles for years. I have a 1995 Ford Taurus SHO 3.0L MTX. I can't seem to keep the car running. I have bought a new alternator and battery as well as idler pulley. The car will still not charge anything. I took the alternator out got it tested it read 17.5 volts. Just to make sure i had it exchanged. Got the new part and still no luck. I've tested all my leads and everything seems to be working fine. What could the problem possibly be? No fuses are blown no major draws no shorts.. I'm totally stumped. Any help would be appreciated.
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Old 11-13-2012, 06:46 PM   #2 (permalink)
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Check grounds and cables.
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Old 11-13-2012, 06:52 PM   #3 (permalink)
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I've done that as well. Still no good. Everything is pulling the correct ground. Voltmeter.
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Old 11-13-2012, 06:55 PM   #4 (permalink)
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So let me make sure: the car will start up and run until the battery dies, correct? Or will it run but not charge the battery.
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Old 11-13-2012, 07:04 PM   #5 (permalink)
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Yes you are correct.. It will start when the battery is charged run for about 15 minutes then dies.. no battery light comes on.
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Old 11-13-2012, 07:08 PM   #6 (permalink)
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Can't remember....internal or external voltage regulator? Could be the culprit if the grounds are good and no draw detected.
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Old 11-13-2012, 07:10 PM   #7 (permalink)
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no external regulator, no fuseable link. Computer issues maybe? throws no codes..

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Old 11-13-2012, 07:17 PM   #8 (permalink)
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Check the fuse I indicated in your other post.

P.S. Please don't double post for the same issue.
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Old 11-13-2012, 07:28 PM   #9 (permalink)
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Checked all fuses are fine.. And i apologize with posting on both sections. I have read the link wrong and unaware on how to delete at this time lol.
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Old 11-13-2012, 08:23 PM   #10 (permalink)
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Okay, then you need to check the voltages on the back of the alternator to make sure the connections and wires are good.

You should have +12V on the large yellow wire and the orange/light blue wire at all times. With the key on you should also have +12V on the light green/red wire from the instrument cluster. If you don't have voltage on the yellow or orange wires the mega fuse might be blown.

There is a field test screw on the back of the alternator for testing, but you have to be very careful using it. When you ground the screw, it will send full current through the field coil, and the alternator should produce maximum output. However, the voltage will not be regulated, so the high voltage can damage other components. Therefore, you must have the screw grounded for only a very short time, like one or two seconds. Obviously have your volt meter set up and ready well before you do this.
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