Toyota's fifth generation Pickup

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engine shuts up when the battery is disconnected

Is the alternator always the problem if the engine shuts up when the battery is disconnected but at time the battery indicator does not come on while the engine is running?

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If you have a multi meter you can check your alternator . With the motor off you should have a voltage of 12.6 min start your truck after starting it should be at at least 13.8 to 15.3 volts (engine running, lights and accessories off). If the voltage is less but comes up when you increase the rpm you may simply have a loose alt belt. If its less with revs your alternator is your problem these voltages are taken at the battery. If you don't have a multi meter another quick test is to turn the radio on and rev the engine. Tune your radio to a low number on the AM band with no music. If the radio whines or goes fuzzy whenever you hit the gas, the alternator is quite likely the culprit.

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mifofana814 it can be the alternator but also the ground wire or any other electrical connection from the charging system. There are places that will check the alternator for you at no cost.

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