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Alternator is not recharging the battery. Have the alternator tested or test it yourself with a volt meter. You should read from 13.5 to 15.5 volts DC at the battery with the engine running. If any lower the alternator needs replacing.

We had already changed the alternator, and bought a new battery. It is still doing the same thing. It will idle ok. When you drive it, you go down the road around a mile or so, and the darn thing shuts down again, and the battery is dead again.

Are you sure the serpentine belt is not slipping? Did you replace the voltage regulator along with the alternator? If you answer yes to both these questions then I suspect you have the alternator wired incorrectly or the battery cables need replacing. The latter is what I suspect is the problem. You may have an internal break in one of the battery cables that just does not show up all the time. Look for a bulge in the cable especially a cable running next the the exhaust.

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11y ago

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