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#4697802 - 03/17/18 05:58 PM Dead F150
ridgerunner Offline


Registered: 01/14/09
Posts: 809
Loc: PA
1994 F150 with 5.0 auto 4x4. Battery was completely dead, would not even light the test bulb. Changed the battery and that new one is now dead the next day. Everything was off and the key was out of the ignition. Now these 2 batteries are completely DEAD! No amount of charging helped in the least. So dead U couldnt even get a shock from it wearing a wool suit and balloons. What would kill them overnight?

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#4697804 - 03/17/18 05:59 PM Re: Dead F150 [Re: ridgerunner]
OVERKILL Offline


Registered: 04/28/08
Posts: 36602
Loc: Ontario, Canada
The Alternator. This has a 2G alternator, correct? She's probably shorted internally. I've had two Ford alternators of that generation do exactly what you've described.
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#4697812 - 03/17/18 06:07 PM Re: Dead F150 [Re: ridgerunner]
mk378 Offline


Registered: 09/27/15
Posts: 1448
Loc: USA
Charge up the battery, get the truck started, and measure voltage at the battery with the engine running but everything else electric turned off. It should be in the high 13s to low 14 volt range. I don't think a 1994 would have a smart charging system. If the voltage stays in the 12s, the charging system is not working and the battery is going to eventually run down.

If that is OK, alternator is working but something may be draining the battery while it is off. The test for this is to disconnect one terminal from the battery then connect an amp meter between the truck and the battery. If it's a heavy draw you could use a 1156 bulb. The bulb should not light. If there is current draw, start pulling fuses and disconnecting stuff. The alternator would indeed be suspect. The alternator's big output wire is connected directly to the battery, so it is live when the key is off.

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#4697813 - 03/17/18 06:07 PM Re: Dead F150 [Re: ridgerunner]
ridgerunner Offline


Registered: 01/14/09
Posts: 809
Loc: PA
Kinda wierd that when the charger was on it read 0.0. Even on boost to start I got nothing, and I mean nothing. No sounds or lights anywhere. U would thing the booster would do something at 100amps.

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#4697816 - 03/17/18 06:10 PM Re: Dead F150 [Re: ridgerunner]
AVB Offline


Registered: 05/20/12
Posts: 1348
Loc: Georgia
What kind of charger are you using? A newer smart charger will sense that something is wrong and won't try to charge.


Edited by AVB (03/17/18 06:10 PM)

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#4697818 - 03/17/18 06:12 PM Re: Dead F150 [Re: AVB]
bbhero Offline


Registered: 03/20/15
Posts: 4730
Loc: Virginia
^^^^^

Great point.
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#4697819 - 03/17/18 06:13 PM Re: Dead F150 [Re: ridgerunner]
ridgerunner Offline


Registered: 01/14/09
Posts: 809
Loc: PA
Most likely a “smart” charger.

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#4697821 - 03/17/18 06:14 PM Re: Dead F150 [Re: ridgerunner]
OVERKILL Offline


Registered: 04/28/08
Posts: 36602
Loc: Ontario, Canada
Originally Posted By: ridgerunner
Most likely a “smart” charger.


If this is a 2G alternator, it should just have two plugs on it. Unplug them and then try and charge the battery.
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#4697824 - 03/17/18 06:17 PM Re: Dead F150 [Re: OVERKILL]
ridgerunner Offline


Registered: 01/14/09
Posts: 809
Loc: PA
Ok I will give it a shot tomorrow. If it charges then dies again then it is the alternator?

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#4697827 - 03/17/18 06:18 PM Re: Dead F150 [Re: ridgerunner]
mk378 Offline


Registered: 09/27/15
Posts: 1448
Loc: USA
You may need to jump from a charged battery or another vehicle to get the battery off of "dead flat" before the smart charger will pick up. Don't start either engine just hook up the jumper cables and let some charge transfer over. Then connect the charger also in parallel and let it charge both for a while.


Edited by mk378 (03/17/18 06:18 PM)

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#4697828 - 03/17/18 06:18 PM Re: Dead F150 [Re: ridgerunner]
OVERKILL Offline


Registered: 04/28/08
Posts: 36602
Loc: Ontario, Canada
Originally Posted By: ridgerunner
Ok I will give it a shot tomorrow. If it charges then dies again then it is the alternator?


Yes. But I wouldn't subject your battery to that again, it is pretty hard on it.
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#4697841 - 03/17/18 06:30 PM Re: Dead F150 [Re: ridgerunner]
ridgerunner Offline


Registered: 01/14/09
Posts: 809
Loc: PA
Decided to try it now. Pulled cables off of battery and now the charger is working. Says 6.4. The charger is a cheap Shumacher 100amp from Walmart. New alternator then?

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#4697855 - 03/17/18 06:40 PM Re: Dead F150 [Re: ridgerunner]
Donald Offline


Registered: 03/21/04
Posts: 20556
Loc: Upstate NY
Find an old charger and use that for several hours then connect up the smart charger.

Or jump good battery to dead and apply smart charger.

When you put the battery back in after charging, don't start the car, wait for a few hours and feel alternator to see if it's warm.

Checking the alternator to be warm might not be a good test in the winter cold.
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#4697862 - 03/17/18 06:47 PM Re: Dead F150 [Re: ridgerunner]
OVERKILL Offline


Registered: 04/28/08
Posts: 36602
Loc: Ontario, Canada
Originally Posted By: ridgerunner
Decided to try it now. Pulled cables off of battery and now the charger is working. Says 6.4. The charger is a cheap Shumacher 100amp from Walmart. New alternator then?


Yeah, that's a pretty solid indication the alt is shorted. Do you have a multimeter? You could test it.
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#4697878 - 03/17/18 07:00 PM Re: Dead F150 [Re: ridgerunner]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 713
Loc: Canada

Any good alternator has to push the battery voltage to over 13V (to a typical max of 15V) if it outputs anything.
Vehicle systems need alternator power, not battery power. The battery should only be charging or floating when the engine is running.

If the battery voltage does not jump, then the alternator is dead. If you shut the engine down and remove
a battery cable and put a DC Amp meter in series and see any current over .030A then you have shorted diodes
in the alternator, if anything you could see 1A to 5A with a shorted alternator, thus killing your battery overnight.

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