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My 2004 excursion dies when I disconnect the battery. I changed the battery and the alternator, they are both new but stills die. According to me all the fuses and relay are good. What could be wrong?

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  • Cars & Trucks Master
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Most vehicles will run with the battery disconnected with the exception of the renaults so check the voltage across the battery and with engine running it should show 14.7 volts but i do feel that in this case youre alternator isnt any good and i would advise you to return it and let the spares shop have it checked out for you ,I always fit a bosch recon unit from the bosch place as i have found that a lot of so called recon units are not a lot of good ,yes i know i pay more for a bosch unit from the bosch agents but at least i never get come backs.Now i know that iam capable of repairing some units myself and i often do but the problem is a lot of the newer units need a special jig to get them apart and back together again like the AC delco units and often when i do take the brush pack out i find the commutator is worn out and this is no chance of repairing with the tools at my disposal so its a new unit iam afraid to say .

Posted on Feb 11, 2012

  • miguel montes Feb 11, 2012

    Problem fixed. one fuse was burnt under the stirring column. Conclussion: the old alternator burnt the fuse. I changed and because the alternator was bad it burnt it again. Then I replaced the alternator but because the fuse was burnt again it still did not work. I just checked again the fuses and found the one burnt. changed and now I disconnect the battery and keeps running. Thank you all of you guys. your suggestions were all very helpful. runnnnnn

  • Colin Stickland
    Colin Stickland Feb 12, 2012

    Well glad to hear you fixed it ,just shows my ignorance here as i do not often come across fuses for charging systems but then i mainly work on old worn out bangers that havent caught up with the modern age ,but if the fusae was the small one under the column then it was controlling the ignition battery warning light as the main thick cable doent normally have one ,and as **** a lot of the older ones are self excited so just the big lead connected they will work this one isnt self excited but ignition excited from the sound of it ,

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SOURCE: Battery and alternator are good but still dies

who ever tested your alternator was wrong replace the alternator

Posted on Mar 19, 2009

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SOURCE: i replaced the alternator and battery still dies out

look for a fuse under the hood check owner manual but it would be in a black plastic box and should be labled or may be a fuselink

Posted on Mar 27, 2009

csmock132
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SOURCE: New alternator and battery battery light stays on and car dies

Have you checked the alternator fuse? The regulator needs power from the fuse to turn on the alternator. The old alternator could have blown the fuse.

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SOURCE: 2004 suburban 1500 battery keeps going dead

Something is obviously putting a drain on the battery, if all the things you had checked are good. If you disconnect the negative terminal on the battery touch it back, it should spark a little, but not alot. If it sparks quite a bit you know something is staying on that shouldn't. Possibly a glove box light, or if your truck has a light under the hood the mercury switch in it may have gone bad causing it to stay on. If it's taking 8 days to go dead you'll be looking for something small. I hope this helps.

Posted on May 10, 2009

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Just got a new battery 2 months ago, now my battery light is on an the battery died.


Just had a similar issue with my 09 CVPI.
Charge the battery, start the car.
Car starts and is running, good.
Now disconnect the ground from the battery.
The car still runs. Battery or wire issues something is draining the battery.
Car dies. The alternator is shot.
Got to junk yard find one for your vehicle.
My "battery" light came on and I pulled both the battery and the alternator too them to be tested. Both tested good on their systems. Did the above test and changed the alternator. No issues as of yet and no "battery light. Problem solved.
Junk yard alternator $25.00, $5.00 core.
New alternator $355.xx plus tax and $15.00 core.
Core is money I will get back when I turn in the old alternator.

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There should be a fuseable link between the alternator and the battery that could keep the alternator from charging the battery.
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Start your car (jump it if necessary)

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If your car does not die after disconnecting the battery cables - then its probably a bad battery and your alternator is working fine.

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