Question about 1996 Ford F350 Crew Cab

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1996 F359 crew cab 4x4 , Battery keeps going dead. When ignition off, and negative post disconnected I get a spark when i touch the lead to battery terminal. I removed each fuse one at a time and checked again, None showed defective. Where is my short???????

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  • jcbatch May 17, 2011

    Ok I tried that and still get a spark. I removed the other terminal , still got a spark. I did have some problems last winter with the doom lights, that was the push switch on one of the doors I lubricated it and problem solved..Tthe lights are not on when all doors are shut, they all work. Is it possible to have a short in the switch and not have the lights come on...thanks

  • jcbatch May 17, 2011 sent a reply that it may be the wasn't so is it possible that it is one of the door switches for the interior lights. i has a problem with one of the doors but after lubricating the switch the problem went away Is it possible to have a short in the switch but still have lights working...thanks

  • jcbatch May 17, 2011

    The door pilar switches all work, lights on and off as they should do. Would a mechanic be able to put this on a diagnostic machine and have the machine detect the problem . I am in agreement with you, if we had a short fuses should blow...thanks



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The most likely cause is the alternator so disconnect the big cable to the alternator and see if you still get this discharge ,this is the most likely cause of battery discharge ,although the alternator will charge the problem lies with the diode rectifier pack inside the alternator whereby a diode goes down and allows the current to run back to earth hence discharging the battery ,yes i know a boot light and silly things like this will also do it but from experiance 99% of the time its the alternator .

Posted on May 17, 2011

  • Colin Stickland
    Colin Stickland May 17, 2011

    dome lights or interior lights ,yes their could be a short here but iam not familar with this model vehicle as iam in spain ,yes we do have jeeps and explorers but few and far between ,also another problomatic cause i often get is add on aftermarket car alarms ,and i have also had on a jeep occasion where the amplifier under the back seat wasnt turning off ,but the switch in the door for the interior light can short out against the body but normally i would expect this to blow a fuse ,Another problem i had once was with a computer fault ,the ECU uses a big transistor to connect the earth so all teh spark and fuel pump ect work for the vehicle to run and this transistor had melted internally causing everything to stay on and this in turn run the battery down this transistor is the in effect the immobilisor switch.try the door pilar switches first though as the next step

  • Colin Stickland
    Colin Stickland May 17, 2011

    no i dont think a scan would read this problem ,i would be inclined to pull all fuses ,take a picture so you know where they go and try for the short with no fuses and see what happens as the spark could be about 5 amp discharge and this may not be enough to blow a fuse .iam going in shower now as its 22.30 in this time zone and i started work at 0800 this morning and iam getting a bit of a stiff back to say the least ,another early start in teh morning i have to go into alicante to the local traffic office to present papers to import a car ,an american ford mustang ,what a job changing the back lights to conform to europeon specs and also to get the mechanical inspection as these american cars do not have a chassis number stamped into them only a plate in the windscreen and for the import duty ?? well they worked a value on spanish car prices which are substancialy higher than UK prices where it was imported through from america,they took the price paid in the UK add a lot more for spanish values then 14.25% at the higher CO2 rate and come up with a figure of 2149euros plus on top of this was the engineers certificate and the inspection ,Still have the registration fee to pay as well ,still i do earn on these paperwork nightmare jobs owing to the british reluctance to learn spanish when they come to live here .So iam not complaining too much .



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