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Why When I start my car the all dashboard warning lights come on and stay on but are pulsating. Could it be the altinator

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  • JOHN LAPIER Apr 02, 2015

    Sliping belt would cause similar condutions .Check the belt tensioner it is a ware part and a lot cheaper then the belt

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It could be the ALT but sounds more like a voltage regulation thing .
You arn't saying what kind of vehicle or engine .
You need to test the chargeing system first .With the vehicle rumming take a volt meter set to 20 volts DC. black to black red to red on the top of the battery termanials you should read 13 to 14 volts if lower bat isn't chargeing .
You may have a built in voltage regulator in side the ALT in witch just replace the ALT
Do the head lights look dim that is sign of ALT .

Posted on Apr 02, 2015

  • Donald StGeorge
    Donald StGeorge Apr 02, 2015

    turned out to be a loose fan belt for the Alt. Thanks for your help

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Check your battery cables make sure there is a clean and tight connection on the battery. Could just be that. Any new wiring been done on the car. Stereo, speakers, after market lights. You may have a bad connection interfering with the computer. It may be a diode going out in the alternator but not likely. If you don't have the testing equipment take your vehicle to advance auto parts they do free battery and alternator testing.

Posted on Apr 02, 2015

  • Donald StGeorge
    Donald StGeorge Apr 02, 2015

    turned out to be a loose fan belt for the Alt. Thanks for your help

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  • Cars & Trucks Master
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Salut donald you didnot mention the model when light flash like lot of time its the alternator that over charging some model the voltage regulator is in the alternotor itself some like a dodge aravan what regulate the voltage is the computer im not saying that the computer is no good lot of time a shorted battery does crazy thing on a vehicule let me no the model ill try to help you bonne soiree . Pierre

Posted on Apr 02, 2015

  • Donald StGeorge
    Donald StGeorge Apr 02, 2015

    MB 560sl.. turned out to be a loose fan belt for the Alt. Thanks for your help

  • pierre laplante Apr 02, 2015

    good could you rate me pleasw

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  • Cars & Trucks Master
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Do you have a remote start system in the car? Some of these cause a pulsating light. They don't go out, but come on bright, then get dim. Back and forth. It stops after the key is inserted and put in the run position.

Posted on Apr 01, 2015

  • Donald StGeorge
    Donald StGeorge Apr 02, 2015

    turned out to be a loose fan belt for the Alt. Thanks for your help

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