458 Megafuse Blown.. anyone else? and Why? | FerrariChat
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458 Megafuse Blown.. anyone else? and Why?

Discussion in '458 Italia/488/F8' started by 328Stuts, Aug 24, 2022.

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  1. 328Stuts

    328Stuts Karting

    Aug 17, 2013
    185
    TN
    Full Name:
    Chris
    #1 328Stuts, Aug 24, 2022
    Hey all, my 175A Megafuse (CAL 5) on the fuse box on top of the battery blew.. henceforth, car wouldnt start.
    Replaced it, works fine.

    No CLUE why it blew in the first place.

    Anyone else have this issue? Any source as in why it may have blown to begin with?
     
  2. FerrariCognoscenti

    FerrariCognoscenti Formula 3

    Jan 19, 2021
    2,429
    East Coast
    #2 FerrariCognoscenti, Aug 24, 2022
    Megafuse?? Sounds serious


    Sent from my iPhone using Tapatalk
     
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  3. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Dec 7, 2003
    16,451
    Winston Salem, NC
    #3 Ricambi America, Aug 24, 2022
    I think the OP is referring to 278366. It's in that battery cover box thing.
     

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  4. 328Stuts

    328Stuts Karting

    Aug 17, 2013
    185
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    #4 328Stuts, Aug 24, 2022
    Actually it’s the one in the left of that but yes that’s correct.
     
  5. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Dec 7, 2003
    16,451
    Winston Salem, NC
    #5 Ricambi America, Aug 24, 2022
    LOL... I just changed the picture! Was eating an ice cream sandwich and wasn't paying attention. ;)
     
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  6. versamil

    versamil Formula 3
    Rossa Subscribed

    Apr 28, 2013
    1,225
    Gaston, Oregon
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    Brian Healy
    #6 versamil, Aug 24, 2022
    Fuses TEND not to blow for no reason. The arrangement makes it difficult to put a clamp on ammeter on the battery wire. It's been awhile since I've looked at my 458 battery, but maybe the negative side has something a clamp on probe would work on. A starter motor can certainly draw a lot of power. Do you know the complete history of your car? No accidents? Hopefully someone from the Ferrari Chat brain trust chimes in, but this should be further investigated. Did your fuse BLOW or did it just open. Is there evidence that it got really hot?
     
  7. 328Stuts

    328Stuts Karting

    Aug 17, 2013
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    #7 328Stuts, Aug 24, 2022

    That’s the confusing part, it’s not like melted plastic or anything, but the car wouldn’t start (all power came on) put an ohm meter on the fuse and it was the culprit …
    Don’t see any bare leads offhand, but the trace is obviously limited to what I can physically see.

    Perhaps maybe the starter is failing, but the car seems to fire up no issues… so I didn’t know if someone else ever had an issue and maybe there was an area to possibly focus on..

    it’s a strange one
     
  8. Gordon G

    Gordon G Rookie

    Jul 2, 2019
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    Louisiana
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    Gordon Geissler
    #8 Gordon G, Nov 11, 2024
    I have the same issue. Where did you find a replacement fuse? My local dealer says they don't carry them?
     
  9. 328Stuts

    328Stuts Karting

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    Chris
    #9 328Stuts, Nov 11, 2024
  10. Melvok

    Melvok F1 World Champ
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    Jul 25, 2008
    14,268
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    Mel
    #10 Melvok, Nov 12, 2024
    Did you install an Interstate or AntiGravity car battery ?
     
  11. 328Stuts

    328Stuts Karting

    Aug 17, 2013
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    #11 328Stuts, Nov 12, 2024
    Ive got an Antigravity in there now, and have had zero issues since doing so
     
  12. Melvok

    Melvok F1 World Champ
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    #12 Melvok, Nov 12, 2024
    I have seen complaints about blowing this same big fuse in other threads, all in combination with these lipo carbatteries
     
  13. cantonyc

    cantonyc Rookie

    Jun 18, 2022
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    Al
    #13 cantonyc, Dec 2, 2024
    Hey I know this is a very old thread, but the same Cal5 fuse blew on my 458 spider with an interstate AGM battery. How did you determine it was a 175amps? There are no markings on mine and online parts lookup has no specs.
     

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