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1991 Nissan Pickup (D21) Question: short circuit

 

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guillermo gonzalez, 4 Cylinder, San Juan, PR, March 19, 2009, 11:03
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i put a new alternator and a new battery and my battery get uncharge in some hours .

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  • Answer #1

    hemicuda March 19, 2009, 11:35
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    Does the battery discharge while your driving or overnight.

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    guillermo gonzalez, March 19, 2009, 20:39
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    it get uncharge driving and when is not driving

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  • Answer #2

    patrick mannion from Greg Solow's Engine Room, March 19, 2009, 23:28
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     Master

    Use a volt meter to see if there is 12volts at the largest wire at the alternator, (this wire goes back to the battery positive terminal) if there is no path for the current produced by the alternator to return to the battery to charge the battery.
    You need a wiring diagram but one of the wires at the back of the alternator becomes live when the ignition switch is on to "excite" the alternator so that it charges when the engine is running.
    Does the battery light come on when the key is turned on and extinguish when the engine is running?

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    Visitor, June 21, 2010, 15:38

    no the battery light dosen't come on

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