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Re: It starts one day then next it dont ..changes the...
Make sure the battery terminals are solid and secure. if the car loses all power and doesnt even crank, its the battery, if the car shows the battery sign it could be the alternator.
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alternator wouldnt stop vehicle from re-starting let sit awhile then restart --alternator charges and runs just about all components on vehicle mechanic should have dont a test on alternator and battery [which can be done for free at most auto stores ] sounds more like a shorting --loose connections damage to a harness or bcm fault[y]
you have a short somewhere it kills the battery after sitting all night make sure no lights are staying on for example you glove box light if it doesnt shut all the way light could stay on and you dont even no it.
Are you sure that you hooked up the alternator correctly? It sounds like the battery is draining and not being recharged. Of course, it could be a voltage regulator that is going bad. Here's a tip to test the alternator- get a boost to start the car. Disconnect the battery and see if the car dies. The car should run from the alternator. The battery is only needed to start the car. So, if the car continues to run with only the alternator, then there is a problem with the battery.
That would make sense, because when he jumped your car if he left it hooked up for awhile. Then he charged your battery up, so it started the next day. Then you drove to his shop and back it ran the battery down. It's easy enough to test and change alternators you could take it to autozone or O'Reillys if there is one close they can test your alternator. If you have more questions about this or if you would like to try and change it yourself just reply to this post and I will walk you through it.
you alternator is no good to ceck alternator start car while running take off positive cable if it dies your alternator is no good but thats what it sounds like
Check the battery first, if it is ok you probably have a bad starter. If the battery is drained, you need to charge and test the battery and alternator.
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