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Dead F150 #4697802
03/17/18 05:58 PM
03/17/18 05:58 PM
Joined: Jan 2009
Posts: 874
PA
ridgerunner Offline OP
ridgerunner  Offline OP

Joined: Jan 2009
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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?

Re: Dead F150 [Re: ridgerunner] #4697804
03/17/18 05:59 PM
03/17/18 05:59 PM
Joined: Apr 2008
Posts: 39,115
Ontario, Canada
OVERKILL Online content
OVERKILL  Online Content

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Posts: 39,115
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.


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
2016 Grand Cherokee SRT - Castrol Edge 0w-40, FRAM Ultra
Re: Dead F150 [Re: ridgerunner] #4697812
03/17/18 06:07 PM
03/17/18 06:07 PM
Joined: Sep 2015
Posts: 1,691
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,691
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.

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

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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.

Re: Dead F150 [Re: ridgerunner] #4697816
03/17/18 06:10 PM
03/17/18 06:10 PM
Joined: May 2012
Posts: 1,406
Georgia
AVB Offline
AVB  Offline

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Georgia
What kind of charger are you using? A newer smart charger will sense that something is wrong and won't try to charge.

Last edited by AVB; 03/17/18 06:10 PM.
Re: Dead F150 [Re: AVB] #4697818
03/17/18 06:12 PM
03/17/18 06:12 PM
Joined: Mar 2015
Posts: 5,868
Virginia
bbhero Offline
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Virginia
^^^^^

Great point.


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Re: Dead F150 [Re: ridgerunner] #4697819
03/17/18 06:13 PM
03/17/18 06:13 PM
Joined: Jan 2009
Posts: 874
PA
ridgerunner Offline OP
ridgerunner  Offline OP

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Most likely a “smart” charger.

Re: Dead F150 [Re: ridgerunner] #4697821
03/17/18 06:14 PM
03/17/18 06:14 PM
Joined: Apr 2008
Posts: 39,115
Ontario, Canada
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OVERKILL  Online Content

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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.


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
2016 Grand Cherokee SRT - Castrol Edge 0w-40, FRAM Ultra
Re: Dead F150 [Re: OVERKILL] #4697824
03/17/18 06:17 PM
03/17/18 06:17 PM
Joined: Jan 2009
Posts: 874
PA
ridgerunner Offline OP
ridgerunner  Offline OP

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Ok I will give it a shot tomorrow. If it charges then dies again then it is the alternator?

Re: Dead F150 [Re: ridgerunner] #4697827
03/17/18 06:18 PM
03/17/18 06:18 PM
Joined: Sep 2015
Posts: 1,691
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,691
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.

Last edited by mk378; 03/17/18 06:18 PM.
Re: Dead F150 [Re: ridgerunner] #4697828
03/17/18 06:18 PM
03/17/18 06:18 PM
Joined: Apr 2008
Posts: 39,115
Ontario, Canada
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OVERKILL  Online Content

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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.


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
2016 Grand Cherokee SRT - Castrol Edge 0w-40, FRAM Ultra
Re: Dead F150 [Re: ridgerunner] #4697841
03/17/18 06:30 PM
03/17/18 06:30 PM
Joined: Jan 2009
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ridgerunner Offline OP
ridgerunner  Offline OP

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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?

Re: Dead F150 [Re: ridgerunner] #4697855
03/17/18 06:40 PM
03/17/18 06:40 PM
Joined: Mar 2004
Posts: 21,813
Upstate NY
Donald Offline
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Posts: 21,813
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.


2015 Subaru Forester 2.5 engine/CVT
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Re: Dead F150 [Re: ridgerunner] #4697862
03/17/18 06:47 PM
03/17/18 06:47 PM
Joined: Apr 2008
Posts: 39,115
Ontario, Canada
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Posts: 39,115
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.


2019 RAM 1500 Sport - Mobil 1 EP 0w-20, FRAM Ultra
2016 Grand Cherokee SRT - Castrol Edge 0w-40, FRAM Ultra
Re: Dead F150 [Re: ridgerunner] #4697878
03/17/18 07:00 PM
03/17/18 07:00 PM
Joined: May 2016
Posts: 725
Canada
i_hate_autofraud Offline
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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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