456 battery light on start up only | FerrariChat
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456 battery light on start up only

Discussion in '456/550/575' started by ferrari_456, May 12, 2012.

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  1. ferrari_456

    ferrari_456 Karting

    Jan 30, 2011
    75
    #1 ferrari_456, May 12, 2012
    I replaced my 456 with a new battery and alternator , when I start up my car, the battery light will come on then go away, everytime is like that. I am getting around 13.3 volts on start up. Could it be the alternator belt which I didn't change?
     
  2. Mr. V

    Mr. V Formula 3

    Oct 23, 2004
    1,247
    Portland, Oregon
    #2 Mr. V, May 12, 2012
    Does it stay on only while cranking, along with a lot of the other lights, and then go off when it starts to run?
     
  3. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,220
    Mount Isa, Australia
    Full Name:
    Pap
    #3 PAP 348, May 12, 2012
    Hi mate, it could be a loose alternator belt that slips on start up causing the battery light to stay on then it goes out when the belt 'grips'.

    Re-check the tension on the belt man. I am assuming that it doesn't 'squeal' on start up, so it might be ok.

    Are you sure they ALL don't have the battery on then off on start up. I am not familiar with the charging system on the 456.

    Why did you replace the battery and alternator to begin with?? Because of this issue you are having now?
     
  4. ferrari_456

    ferrari_456 Karting

    Jan 30, 2011
    75
    #4 ferrari_456, May 12, 2012
    Last light to go off, after cranking it idels normaly. It wasn't like that before
    , all lights would go off together...
     
  5. ferrari_456

    ferrari_456 Karting

    Jan 30, 2011
    75
    #5 ferrari_456, May 12, 2012
    So should I also replace the belt? No squeal......... previously alternator and volbattery tested no good. Is 13.3 volts normal during start up? When I am driving is only showing 12.5 to 13v..... loose belt possibly ?
     
  6. PAP 348

    PAP 348 Ten Time F1 World Champ
    Lifetime Rossa Owner

    Dec 10, 2005
    100,220
    Mount Isa, Australia
    Full Name:
    Pap
    #6 PAP 348, May 12, 2012
    No need to replace the belt if it's OK and not squealing.

    So the old battery and alternator were no good, fair enough.

    But I probably wouldn't pay REAL close attention to the accuracy of the volt gauge in car, if that is where you are getting these charging numbers?

    I would recheck the belt tension, just incase it IS slipping................but not squealing.

    Then, check the battery voltage at the battery and alternator with a multimeter.
     

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