Question about 2002 Ford F250 Super Duty SuperCab

10 Answers

Alternator running very hot.

After just minutes of idle time alternator is very hot. New alternator and batteries have been checked several times. While running and once batteries are charged total load on alternator is around 60 amps with no accessories on, ie headlights and heater. Have also noted that there is a 50+ amps draw from batteries just with the key ahead, but only until something stops running. Please, any ideas.

Steve

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  • steve_eltech Jan 29, 2009

    I have a 2003 superduty King Ranch diesel with single alternator. On my third alternator since Dec 22nd. Have had the batteries tested several times and they appear to be fine. After just twenty minutes of idle time the alternator is hot enough to fry eggs on. Alternator putting out 14.0 volts and about 35 amps with everything off. Can't seem to fine anyone that can fix this problem. Please help as I'm afraid it will catch fire.

  • steve_eltech Jan 29, 2009

    Had both batteries checked, I'm told they are fine. Just checked again and total amp draw is 38 amps. A little snow on the alternator and it sizzles.

  • steve_eltech Jan 29, 2009

    This is the third alternator, all alternators have had the same results.

  • steve_eltech Jan 29, 2009

    Alternator only putting out 38 amps. This should not be enough to cause it to overheat it such a short time. Again I have had the batteries checked and this third alternator is the original one now rebuilt.

  • steve_eltech Jan 29, 2009

    Yes the glow plugs do turn off in the dash. Have only changed one battery as it seem I had more of an amp draw on that side.

  • steve_eltech Jan 29, 2009

    It's only now after an hour that I can hold my hand on the alternator.

  • steve_eltech Jan 29, 2009

    Anyone have any other ideas?

  • steve_eltech Jan 29, 2009

    Any idea where this isolator maybe located?

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10 Answers

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Dear FixYa Customer steve eltech,

RE: 2002 Ford F250 Super Duty SuperCab Repeated Alternator Replacement!
I've done some digging and found a mechanic with what I believe is some good advice that relates to your problem!
You should read his blog by clicking on the following http:// link @ http://www.trustmymechanic.com/auto-repair/07/2000-ford-f250-super-duty-headlights-flicker-alternator-problem.html

This looks like it will save you some time and money!
Alternator running very hot. - d67efa5.jpg jackiaria
Please click back to this FixYa site when your done reading and rate me.

Posted on Jan 29, 2009

  • Jack Iaria
    Jack Iaria Jan 31, 2009

    Dear FixYa Customer Steve,



    If I were you I'd go to the following web site and enter your town to find the closet alternator shop near you then have them test your alternator and give you their best possible solution to your problem. Click on the following http:// link to go to magicyellow online yellowpages' alternator repair or look in your local phone book for alternator repair nearest you!



    http://www.magicyellow.com/category/Alte...



    Hope this will FixYa!!!!


    jackiaria

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Might want to check the battery isolater... i would say it has failed

Robert

Posted on Jan 29, 2009

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Welcome to Fixya! Have you thought about Upgrading to a High Output Alternator? Please Rate my Solution, I need all the Help that I can Get! Thanks!

Posted on Jan 29, 2009

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Obviousely there is a amp load on charging system. if it is drowing only when it is running not when the engine is off .it is to do with your glow plug circuit.use an amp probe on the glow plugs main power wire to see if after the engine is warm and running the plugs still activated..most othe circuits need less than 20 amp to operate ,but glow plugs usualy need 25 to 30 amp to run..if they stay on while running you need a control unit.good luck.

Posted on Jan 29, 2009

  • mnabi01
    mnabi01 Jan 29, 2009

    also if you only have problem with one battery chek the battery isolator . if it gronds internally it causes battery drain and alternator trying to charge that battery constantly.

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I would replace the alternator and see if that wont cure the problem. id think the batteries were pushing too many amps back to the alt but id try changinfg the alternator

Posted on Jan 29, 2009

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Hello, Your large amp draw when you turn the key on is the glow plugs turning on. They turn themselves off when the cylinders are heated up enough to start. There is a light symbol on the instrument panel, bottom left, that looks like a coil of wire. That's the glow plug symbol. Your supposed to wait for that to turn off before you start.
Check and see if that light goes off. If not you need to replace the glow plug controller.
Also these Diesel trucks have a 12/24 volt system. The starter is a 24v starter so if some thing is connected wrong it can cause high current draw.

Posted on Jan 29, 2009

  • David Robinson Jan 29, 2009

    Let's talk about when you replaced your batteries. How long ago did you replace them? Who did the replacing? And did you replace both at the same time?

  • David Robinson Jan 30, 2009

    I have one on my boat but, not on my 2004 F-250 SuperDuty 6.0 diesel.

    On diesels you should always replace both batteries at the same time.

    You have a short in the battery or somewhere else. you need to check your grounds also because of the 12 to 24 volt transitions.

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Is your battery Low or poor?? Charge your battery on slow charge for 8hrs to give it a good deep charge, Installing an alternator on a low or dead battery will ruin it and also not charge your battery properly.. An alternator is not a battery charger its a battery maintainer

Posted on Jan 29, 2009

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  • 250 Answers

Check for the impellor or fan rubbing on the casing. 
Check for worm bearings. 
If the alternator is running at full load the casing will become hot 

Posted on Jan 29, 2009

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Check and see how many amps the alternator is putting out when vehicle
is in normal operation. If too many amps is being drawn from the alternator
causing it to be near its peek output, it will cause the alternator to
become hot which will shorten its life. My guess would be the battery
causing it to do that.

Posted on Jan 28, 2009

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50 amps at 12 volts is 600 watts of power being used somewhere in the vehicle.

Something has to be getting real hot, or, it could be the ABS pump motor is running. This is a common failure with ABS systems, and you may need to get the ABS relay board rebuilt.

Reply back if you hear something running with the key off.

As for the alternator getting hot, well, it's working pretty hard to keep up with the vehicle power load.

Posted on Jan 28, 2009

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