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Why might a vehicle not charge after replacing the battery and alternator?


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2015-07-17 17:53:13
2015-07-17 17:53:13

A lot of new vehicles have a master system fuse under the hood that might be blown.

I've found that the wire from the alternator to the positive terminal (which runs the actual charge to your battery positive terminal) is sometimes bad. You can bypass it by adding a wire at the small post at the back of the alternator then running it to the positive battery cable (attach it any which way). The original wire is the small one which runs attached alongside the battery cable. Bypassing it will let you see if it is bad or not. I actually have left the new wire on this way and never stalled or had starting problems since. Try it even though your battery is fully charged.

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the work of an alternator is to charge up the battery while the vehicle is in motion

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Do you mean charge by the vehicle running....or do you mean take a charge from a Bench charger? if its in the vehicle it could mean that either the battery/battery connection/cables, a faulty ground, or the alternator is defective. If its on a bench charger then the battery has a dead cell or is defective and needs replacing.

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You cannot charge a battery without a battery charger or having it charged by the alternator in your vehicle while it is running.

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That is the purpose of an alternator. The keep the battery charged and to run all the electrics on the vehicle. However it is never a good idea to allow the alternator to charge a dead battery. This will put a strain on the alternator and may damage it.


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