Truck will not start

If jumped it turns on then turns back off when disconnected

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Have you checked that the alternator is working?

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Check the battery, check all connections, and check the alternator. If the battery is completely flat the alternator could be damaged by overdrawing on it as it tries to revive a dead battery. Battery life can be affected by many things but if it's over 3-4 years old definitely get it checked.

Try charging the battery; if it won't hold a charge replace it. If it does hold a charge (or you replace it with a fully charged battery) the truck should run; if it does run, make sure to also get the alternator checked. A lot of the Auto parts supply stores will check the function of both the alternator and battery for free.

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