355 - How do you check the charging system? | FerrariChat
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355 How do you check the charging system?

Discussion in '348/355' started by squid, Sep 23, 2023.

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  1. squid

    squid Karting

    Oct 5, 2006
    153
    #1 squid, Sep 23, 2023
    With the battery buried in the front fender and the alternator all the way at the bottom, against the firewall, I can't see a place to see how many volts this car is putting out. How can I check the charging system?

    I'm wondering if the alternator or battery are going down as each time I plug it into my battery tender it takes two full days to reach a "full" charge according to my CTEK. I would expect it to be closer to a couple of hours at most if everything was healthy as I always store it on a tender.
     
  2. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    14,263
    Sydney
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    Ian Riddell
    #2 Qavion, Sep 23, 2023
    This:

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    Alternatively, you can check the volts at the fuses in the frunk or in the passenger footwell. Some of the fuses have live battery power on them.

    Frunk:
    Headlight motor controller
    RH Headlight motor
    LH Headlight Motor
    Radio
    Hazard Warning lights

    Passenger footwell:
    Fuel injector power (Two fuses on Motronics 2.7 car, one on 5.2 car)
    Secondary Air Pump
    RH Electric Windows
    LH Electric Windows
    Roof Lights and Doorlocks
     
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  3. steved033

    steved033 F1 World Champ
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    Apr 12, 2017
    10,049
    Atlanta, GA
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    Steve D.
    #3 steved033, Sep 23, 2023
    meter on battery. + to +, - to -. 12V with car off. more than 12V with car on ...usually 13.8 to 14.1.
     
  4. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    14,263
    Sydney
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    Ian Riddell
    #4 Qavion, Sep 23, 2023
    I think "squid" was looking for a way to check the battery without having to pull the wheel off and the fender liner.

    If you didn't want to pull your car to pieces, you could also check the volts at the engine compartment battery bus bar (on the right hand side)...

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    Lift the flap with the red + sign on it and put your red voltmeter probe to any of the terminals... and your black voltmeter to probe to the big earth bolt next to the box with the red + sign on it.

    Some owners attach their trickle chargers to this anyway.

    Make sure your battery cutoff switch is not in cutoff.
     
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  5. squid

    squid Karting

    Oct 5, 2006
    153
    #5 squid, Sep 23, 2023
    Bingo, thank you. I can't believe I missed that!
     
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  6. steved033

    steved033 F1 World Champ
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    Apr 12, 2017
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    Atlanta, GA
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    Steve D.
    #6 steved033, Sep 23, 2023
    yeah...don't listen to a 348 owner with a rear battery...LOL

    sjd
     
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  7. squid

    squid Karting

    Oct 5, 2006
    153
    #7 squid, Sep 23, 2023
    14.64 volts, must just be my tender trying to top off a dying battery. Thanks all
     
    Qavion likes this.

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