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Thread: Changed alternator, still have battery light

  1. #1
    Join Date
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    Default Changed alternator, still have battery light

    Just changed out the alternator on the 2000 duratech. Battery light is still on after starting. Have had the battery checked and is OK. Anybody have any suggestions or advice? A little background, I had taken it to Autozone before changing the alternator and they said the old alternator was only putting out 4 amps.
    Better to ask a question and be THOUGHT a fool for 5 minutes than to never ask and BE a fool for life.

  2. #2
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    Verify the following, on a FULLY CHARGED battery...

    start the vehicle
    test battery voltage while running.
    13.7-14.2 VDC +- 0.1volts?

    shut off car.. turn on headlights for 60 seconds.
    battery voltage 12.0VDC or higher?

    if the "running" voltage isn't enough, (like the same as the battery voltage) then check the "mega fuse". Its location can be found in the alternator how-to (duratec maintenance forum, in the "read first" thread.
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  3. #3
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    OK, just pulled the megafuse and did a resistance test and it looks good to me. I'll get a new one to put in but am not real confident that this is going to fix it. BTW, the battery light came on when I started it one morning. No flickering, just a solid light.

    If not the megafuse, not the alternator (OEM from a salvage yard), can I have the old alternator bench tested at Autozone or a mechanic?
    Better to ask a question and be THOUGHT a fool for 5 minutes than to never ask and BE a fool for life.

  4. #4
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    Just replaced the megafuse, still have the battery light. When I went to get the fuse, I took the old alternator that I thought was bad and it bench tested good. So, it wasn't the alternator, wasn't the megafuse.

    Also, did the voltage checks recommended in the post above. Had 12.7 volts at the battery when sitting, 12.04 volts when running. I'm stumped, know it wasn't the alternator, know it wasn't the megafuse, what next? HELP!!!!
    Better to ask a question and be THOUGHT a fool for 5 minutes than to never ask and BE a fool for life.

  5. #5

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    Quote Originally Posted by Contour_dave View Post
    Just replaced the megafuse, still have the battery light. When I went to get the fuse, I took the old alternator that I thought was bad and it bench tested good. So, it wasn't the alternator, wasn't the megafuse.

    Also, did the voltage checks recommended in the post above. Had 12.7 volts at the battery when sitting, 12.04 volts when running. I'm stumped, know it wasn't the alternator, know it wasn't the megafuse, what next? HELP!!!!
    There are only three things which can be wrong.

    1) Alternator.
    2) Wiring from alternator to battery
    3) Megafuse

    * 4) If it were an earlier model, I would say Fuse 5 (Fog lamps) is blown. Put a new fuse in just to humor me.

    Edit. Did you test the battery per Ray's instructions? Headlamps on for one minute. Then check for voltage across battery terminals. If you did not, then maybe the battery is the culprit.
    Last edited by Tony2005; 01-20-2007 at 04:27 PM.

  6. #6
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    Thanks so much for the help. There are several wires coming off of the alternator. I presume that if any one of them are bad in some way, then the alternator won't charge correctly? Any suggestion on which one to start with and trace? Which one goes from the alternator directly to the battery?

    The fog lights are working so I presume that fuse is OK. I pulled the battery early on and had it tested. Tested good.
    Last edited by Contour_dave; 01-20-2007 at 04:44 PM.
    Better to ask a question and be THOUGHT a fool for 5 minutes than to never ask and BE a fool for life.

  7. #7

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    Try Figure 16 in Autozone link.
    http://www.autozone.com/servlet/UiBr...3d801eb32d.jsp

    IIRC, Rawburt had posted a good picture in the old forums fo the wiring. And Ray's Alternator how to has descriptions of the wires.

    Edit. Ray's Alternator how to in Duratec Maintenance Read First.
    http://www.contour.org/ubbthreads/sh...rue#Post838883

    Rawburt's picture is in that link too.
    Last edited by Tony2005; 01-20-2007 at 04:55 PM.

  8. #8

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    Quote Originally Posted by Ray View Post
    then check the "mega fuse". Its location can be found in the alternator how-to (duratec maintenance forum, in the "read first" thread.
    I am having the same troubles with my car and want to change out the mega fuse. I read the how to but can not find the part about the mega fuse. Can you help point me in the right direction?
    00 V6 Auto - Buick Century
    96 V6 MTX - My Ride (Gone)
    95 I4 ATX - Wifes Ride (RIP)

  9. #9

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    Under the Ignition Coil. Picture in this thread, also in previous thread by Ray.
    http://www.contour.org/ubbthreads/sh...ue#Post1053516

    Edit. A picture of the megafuse here.
    http://www.contour.org/ubbthreads/sh...ue#Post1273703
    Last edited by Tony2005; 01-21-2007 at 03:13 PM.

  10. #10

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    sweet, Thanks!
    00 V6 Auto - Buick Century
    96 V6 MTX - My Ride (Gone)
    95 I4 ATX - Wifes Ride (RIP)

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