Question about 1997 Ford F150 Regular Cab

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Have new battery and new alternator and battery still goes dead while driving

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  • mrbob1051 Aug 10, 2008

    Alternator is good but engine dies when battery disconneced. Seems to be running on battery power only. If a fusible link in alternator circuit, please describe location of link.

  • stacielynne Sep 07, 2008

    new battery and it's still going dead. what can we do?

  • woodfloorrx Oct 04, 2008

    battery/alternator both good battery still being drained

  • tomalight Oct 10, 2008

    i located a fusible link replaced it and that fixed the problem. fusible link hard to check cause wire still looks good but when testing it found the wire inside the insulation was gone. the link ran from the relay on the fender wall. it is a small wire and feeds four wires going to the alternator. new link was only about five dollars.

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Check fuse for circuit, some f150's came with charging fuses. other suggestion is main 175 amp fuse in main harness located on fire wall,

Posted on Oct 07, 2008

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If goes dead while driving not charging possible bad alternator. If goes dead regardless of driving probably a power drain somewhere. Easy way to test alternator is test battery voltage with a multimeter and make sure at least 12.5. Start car check voltage again and see what it is shot be around 14. If not alternator is most likely bad.

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wow no year stated, nor car. a willis jeep> 1945?
in 1945 it has no Alternator !
General answer , for all cars:
dead parked, or dead moving ?
no person can help lacking that critical fact,
sounds to me like, impossible question !
if it goes dead moving the alternator /gen system is failing.
if the battery goes dead parked, that means you have phantom drain.

we can find out which it is , with a $10 DMM meter at walmart
$20 is a better buy.

so if it drains over night check for lamps stuck on.(aka. dark current)
if drain driving, then.
check for 13.3 to 15vdc, running, engine.
if low, the alternator system (charge) is failing
at no time did i say any part was bad or to buy them. (i never do until i do tests)
drains here.
http://www.fixkick.com/drain/drain.html
works on all cars.

moving dead.:
there are other rare causes..
like the engine will not idle at 800 rpm or more.
see this, the alternator goes off line below that much.
and can drain a battery fast deep in the city at infinite red lights
and traffic jams.
that is why getting a car with hands on service by a real ASE
tech, works best , he /she sees all this in 5 min flat.
saving all this grief.
like , oh crud, it idles a 500! (that be it)
or charge lamp is on?

the old jeeps love to kill batteries, with old DC generators. (ask)
oh my, the OBD2 scan tool says my ALternator is off line.
or other DTC errors, about power lost to many places.
use a scan tool if car is newer.


this car?
http://barrettjackson.com/staging/carlist/items/Fullsize/Cars/96748/96748_Rear_3-4_Web.JPG

sad the owner can't tell year or model.

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