TT Editors
Administrator
| Posts: 532
| Joined: 02/07
Posted: 01/30/09
11:33 AM
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Question: I just changed out the electronic control module, distributor cap, coolant fan, and battery, and installed a new alternator (second one in three days) on my 1993 2WD Ford F-150 with the six-cylinder engine. When testing the battery and the alternator, the alternator isn't getting excited enough and my battery keeps draining. I've soldered and shrink-wrapped the leads from the alternator, and the battery light indicator on the dash display is still on.</i>
Answer: Ford ran into trouble with multiple alternator failures on this vintage F-Series, and it wasn't due to a bad batch of alternators. The first failed alternator produces excessive heat in the alternator circuits, damaging the terminals in the connector between the wiring harness and the alternator. This damage produces excessive circuit resistance, which can trash a brand-new alternator shortly after installation, and the next one, and so on. Always inspect the wiring-harness-to-alternator connector for corrosion, distortion, and cracking before replacing a failed alternator. Ford's complete connector kit, part number E5AZ-14305-AA, can help. If this connection wasn't where you soldered and shrink-wrapped, if it wasn't done correctly, or if you did it after the current alternator was a goner, that may be where your problem lies. If everything looks right, take it to a technician with the appropriate charging-system diagnostic tools and wiring diagrams to figure things out.
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If you have a technical question regarding your pickup, SUV, or van, feel free to contact Alex Steele, a master technician with the National Institute for Automotive Service Excellence. Send a letter to him in care of Truck Trend Garage, 6420 Wilshire Blvd., Los Angeles, CA 90048, or e-mail us at trucktrend@sourceinterlink.com.
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arehm
New User
| Posts: 1
| Joined: 01/09
Posted: 01/30/09
07:03 PM
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I have the same problem with my truck also year 93, f150 2 wheel drive. the alternator gets hot and drains the battery. This has been the 2nd alternator I've replaced. Great info on the alternator connector. Although I did not see any corrosion or melting in connector, I'll replace it and exchange the alternator to see what happens. Thanks for the info.
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