Question about 2002 Ford F250 Super Duty SuperCab

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2003 F-250 6.0 diesel charging problems

Charging system on the truck was fine for the first 3 1/2 years than the batteries started going dead. Brought it to the Ford dealership and said the charging system and batteries were fine. They said I had to drive the truck more and the batteries were going dead because I did not use the truck enough. I still have the same problem. I can charge the batteries and drive the truck on a regular basis and in a couple days the batteries go dead. There are no indicator lights going on saying that the charging system is not working. There is nothing in the truck that is plugged in that would cause a discharge. I finally bought two new batteries because the old ones were going dead so quick .The new batteries went dead after 10 days. Connections at the battery are perfect. I was using the truck on a regular basis when this happened this time and they still went dead. Where do I start?

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  • dennis55753 Nov 22, 2008

    As stated, I just put it in two brand-new batteries and I have the same problem.

  • dennis55753 Nov 22, 2008

    I know what you're talking about but I checked for that and kept a close eye on the truck and the lights stayed off.

  • dennis55753 Nov 22, 2008

    It's hard for me to answer your question when I already had the Ford garage and two other shops look at it. I could not tell you exactly what they did to check this out but maybe they did not dig in to it enough. There is a good possibility that the batteries and the alternator were working properly but maybe they did not check for any accessories that would be draining the batteries when the truck sat. I honestly don't know if they did that.

  • dennis55753 Nov 22, 2008

    A good friend of mine is a excellent mechanic and he will look at the charging system in depth this coming week such as checking the alternator for charging and anything that could be causing the batteries to be discharging. I just spoke to him and he is going to dig into it. Like I said, I had absolutely no problems with this truck for the first 3 1/2 years. I live in northern Minnesota and this truck started when it was 40° below zero faithfully and I didn't even have it plugged in. Something went wrong. Go figure!

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You have a dead short somewhere in electrical system. have the alternator checked even tho it is new.these have been known to be bad many a times. also have the starter motor taken out and checked by a good automotive electrician.these can have a short but still workcheck the voltage regulator.these are either built into alternator or are connected remotely
the alternator and battery complete the electrical circuit, so if one is bad it will stop the vehicle when battery charge is gone

Posted on Nov 22, 2008

  • smarttech Nov 22, 2008

    This can also be caused by a weak or bad regulator switch. 


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Sir,

After you check the fuse, check the charging circuit relay. You will need to check the owners manual for location. fuse may be blown. replace fuse

thanks
good luck

Posted on Nov 22, 2008

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You apparently have a dead short in the system. Something is draining the battery when the vehicle is off.

Typical is a cigarette lighter pushed in, in an always hot socket, that doesn't pop out.

Similar to leaving the lights on, this can be a light bulb that has burn't out, but has caused an electricat short.

Have you replaced any fuses lately, where you did not replace with the correct amp fuse?

Is there another device that is always on, like a CD Changer, TV, etc. , or any device in the truck bed that is connected to the battery, like a fuel pump.

Do you haul a trailer, check the trailer hitch wiring for a short. ( Common area for a short to occurr )




Posted on Nov 22, 2008

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Hi,

Initially, a test, on ignition ON (but not engine running or started) does the red charge light lit up? if yes, then the indicator works and the sensor works; if no, then indicator light is faulty and the batteries are not charging but you are not informed. Additionally, pls try:

  • check the alarm system including the triggers, door switch;
  • while park (preferably at night), run the engine at idle and note the RPM, switch on the headlights, RPM should be maintained or down a little. Thereafter, step on the brakes. If the headlight dims a bit, then the alternator is not pushing enough charge to the battery, if not then charging is working; alternately, you can try the A/C instead of the brakes although normally there is an idle compensator when A/C is engaged;
  • manually hardwire an ammeter to the battery to visually determine if the battery is really charging and if so by how much.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 22, 2008

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Hi,

There is a "Load" on the battery... something is running, causing it to drain... need to check for voltage draw in the vehicle while shut off.
Thank you.

Posted on Nov 22, 2008

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Do you have an alarm? radio works good? amplifier (if applicable)?
something is draining the power when not running, you will need to determine what uses the battery power when the engine is not running and see if it has a pull on the power. you can do this by disconnecting what ever uses the power when not running ,( radio , alarm , amp. , ect..) and then reconnect it with the dome light on to see if the dome light goes dim when connected , this would indicate a big power draw.
what kind of tests have you already done?

electech

Posted on Nov 22, 2008

  • jason Nov 22, 2008

    well without any definitive answers or tests we can only speculate what the problem could be , but know that there has to be a drain from some device or accessories or the alt. is not doing its job be cause of regulator or charging system



    electech

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Sounds like a problem that had us scratching our heads just like you are now. Do you park it in the garage the guy who had this problem found out that his interior lights were coming on while his truck was parked in the garage and the batteries drained just like yours. All systems checked out just like yours but something was coming on during the evening that was just enough drain to do the batteries in. We finally installed battery post shut offs(any parts house)he simply shut these off during times that the truck was parked for longer than a day or two and it fixed it. Your guys have already checked out all the obvious so when you park it go out and make sure there are no light on even a small one can do it. Good Luck

Posted on Nov 22, 2008

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Check the distill water level in the battery.. that could be one reason.

Posted on Nov 22, 2008

  • Legin Varghese
    Legin Varghese Nov 22, 2008

    may be hooked up backwards?
    or there is something draining the battery whilst engine is off.
    get
    a multimeter and start the truck. as soon as you get it started measure
    the voltage coming from alternator. observe the minus sign carefully
    and ensure you have the right leads going to the right side of the
    battery. upon starting it should read around 12.8v rev the engine up a
    bit and keep it reved up for a minute or 2 and it should read around
    14.4v. let us know how you get on....kevin

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