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Got a question on the heater/blower circuit blowing a fuse.

Discussion in 'Boxers/TR/M' started by silvergts1998, Dec 24, 2007.

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  1. silvergts1998

    silvergts1998 Formula 3

    Apr 10, 2005
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    #1 silvergts1998, Dec 24, 2007
    My blower seems to blow the 20 amp fuse in the fuse panel. I haven't had a chance to dig in it yet, but I will. Just trying to narrow down what it could be first. Any ideas?

    Here's the deal:

    I put a 20 amp fuse in and it seems to work fine for a few minutes and then it blows the fuse. So I don't know think it's a hot wire grouding out issue because if it was I would think it would blow the fuse immediatley. Sounds like a minor issue, but anyone have any tips where to look first?
     
  2. Arvin Grajau

    Arvin Grajau Seven Time F1 World Champ

    Jun 7, 2006
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    #2 Arvin Grajau, Dec 24, 2007
    IMO get the fuse box upgrade that is on this section.
     
  3. silvergts1998

    silvergts1998 Formula 3

    Apr 10, 2005
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    #3 silvergts1998, Dec 24, 2007
    Where's this fuse box upgrade? Still would like to know what might be causing my blower fan to blow a fuse.
     
  4. Arvin Grajau

    Arvin Grajau Seven Time F1 World Champ

    Jun 7, 2006
    78,324
    Wurundjeri man.
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    #4 Arvin Grajau, Dec 24, 2007
    Boxer repair thread
     
  5. silvergts1998

    silvergts1998 Formula 3

    Apr 10, 2005
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    #5 silvergts1998, Dec 24, 2007
    it shares the same fuse box as the 512 TR?
     
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
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    #6 Steve Magnusson, Dec 24, 2007
    One thing to check is that the physical & electrical connections from the female terminals of the fuse socket onto the male terminals of the fuse are in very good condition, clean, tight fit etc.. If these connections have even a small contact resistance (like 0.05~0.1 Ohm), the current is high enough that there will be significant I^2*R heating of the metal parts of the fuse -- e.g., a 20A fuse carrying 10~15A initially when it's cold is OK, but if it gets heated up/softened by 5~20W heating at the (bad) connection for a few minutes, it could blow at a current below 20A. Just a thought; otherwise, you'd need to measure the current in the fuse when it blows (but most handheld multimeters only go to 10A so this may not be so easy).
     

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