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Cig Lighter Fuse - What else is on the circuit?

Discussion in '360/430' started by S F, Sep 6, 2020.

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  1. S F

    S F Karting

    May 13, 2016
    164
    Texas
    #1 S F, Sep 6, 2020
    Have an issue that has popped up on my 360 where I seem to have a short. I keep blowing the 15a cigarette lighter mini fuse that also powers the OBD port. The clock also seems to be on this fuse as it no longer works.

    So far I've tried completely disconnecting the lighter, overhead console lights and the clock; however, the fuse still instantly blows. Any ideas on what else is on this circuit so I know where to look next or how I can further troubleshoot this headache?

    Any input would be greatly appreciated!
     
  2. 24000rpm

    24000rpm F1 Rookie

    Aug 31, 2012
    4,650
    China and California
    #2 24000rpm, Sep 6, 2020
    when you say "instantly blows", when is that? When you put the key to II position?
     
  3. S F

    S F Karting

    May 13, 2016
    164
    Texas
    #3 S F, Sep 6, 2020
    As soon as a new fuse is inserted, even with the key off.
     
  4. 24000rpm

    24000rpm F1 Rookie

    Aug 31, 2012
    4,650
    China and California
    #4 24000rpm, Sep 6, 2020
    430 or 360 modena, or CS? they are wired differently

    430 and CS are wired the same. 360s are diffferent


     
  5. S F

    S F Karting

    May 13, 2016
    164
    Texas
    #5 S F, Sep 6, 2020
    2000 360 Modena.
     
  6. 24000rpm

    24000rpm F1 Rookie

    Aug 31, 2012
    4,650
    China and California
    #6 24000rpm, Sep 6, 2020
    without the fuse, would you use a multimeter and see what's the ampage between fuse socket's 2 poles. see what ampage you got
     
  7. S F

    S F Karting

    May 13, 2016
    164
    Texas
    #7 S F, Sep 6, 2020
    It went to 19.9, not sure if my meter maxed out or what. As soon as the fuse blows or the multimeter is pulled off, the F1 primes again, which is a bit odd as it’s like I’m opening a door.
     
  8. 24000rpm

    24000rpm F1 Rookie

    Aug 31, 2012
    4,650
    China and California
    #8 24000rpm, Sep 6, 2020
    I don't know the history of the car (ever messed with? )

    I m not an expert. I'd think you should check all grounds first

    electrical issue can be extremely hard to diagnose, even on-site.


     
  9. S F

    S F Karting

    May 13, 2016
    164
    Texas
    #9 S F, Sep 7, 2020
    I noticed the glove box wiring appears to have been pulled down at one point as the wires were ran in an odd fashion. It's possible they've been pinched as the battery cover area is extremely close to where the wires are running. Is there any way I can test these for a short?

    Also, which grounds would you recommend that I check?
     
  10. dbdreams

    dbdreams Karting

    Nov 6, 2003
    216
    Hayden, Alabama, USA
    Full Name:
    David W. Burnett, Jr.
    #10 dbdreams, Oct 6, 2020
    The OBDII port is on the same fuse I believe. I had to disconnect the wires to the cigarette lighter to get my OBDII port to work. I assume they are on the same fuse.
     
  11. S F

    S F Karting

    May 13, 2016
    164
    Texas
    #11 S F, Oct 7, 2020
    Yes they are, the OBDII port is the main reason I am trying to diagnose this as I won't be able to pass inspection without it next year.

    I disconnected the wires to the cigarette lighter and glove box light; however, the fuse continues to blow. I haven't messed with this in a few weeks as I ran out of fuses but it is on the back of my mind and I'd love to get it sorted soon.
     
    dbdreams likes this.
  12. dbdreams

    dbdreams Karting

    Nov 6, 2003
    216
    Hayden, Alabama, USA
    Full Name:
    David W. Burnett, Jr.
    #12 dbdreams, Oct 7, 2020
    Check the overhead light and clock. I think it may be on the same fuse.
     
  13. Bob in Texas

    Bob in Texas F1 Rookie

    Apr 23, 2012
    2,722
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    #13 Bob in Texas, Oct 7, 2020
    Aftermarket stereo or radar detectors?
     
  14. S F

    S F Karting

    May 13, 2016
    164
    Texas
    #14 S F, Oct 7, 2020
    Indeed they are. Unplugging both had no effect unfortunately. Makes me think an actual wire might be pinched or shorted somewhere.

    No, but come to think of it, it got worse after I did the aux input into the stock head unit. It may be worth my while to pull the head unit back out and look for obvious issues.
     
  15. Qavion

    Qavion F1 World Champ
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    #15 Qavion, Oct 10, 2020
    The door lights are also on the same fuse. If it's not the glovebox wiring, you could try disconnecting the door plugs to see if the fuse still blows.

    I strung this diagram together to show the wiring hookup

    Fuse 70 wiring

    All the wiring is light blue
     
  16. Qavion

    Qavion F1 World Champ
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    #16 Qavion, Oct 10, 2020
    The parking light switch also uses fuse 70. If it's not too difficult, you could also try disconnecting the plug on that.
     
    S F likes this.
  17. Qavion

    Qavion F1 World Champ
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    #17 Qavion, Oct 10, 2020
    There is no point checking grounds. Grounds don't cause blown fuses. You have a power wire touching the car's chassis or touching an earth wire with damaged insulation (or a shorted device, such as a bulb or switch).

    Does the glovebox just have the two wires for the light or is there something else powered in the glovebox on a 360?
     
    S F likes this.
  18. Qavion

    Qavion F1 World Champ
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    #18 Qavion, Oct 10, 2020
    Another thing to try would be to pull out the "door open" red marker light assemblies to see if there are any broken wires shorting to earth. Also remove the bulbs in case they are shorted internally.

    If none of these suggestions work, you may want to consider dividing the power circuit into 2 halves. This may involve cutting a blue wire near the fuse or accessing a connector in the forward console area (not sure which is the easiest).
     
    S F likes this.
  19. Qavion

    Qavion F1 World Champ
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    #19 Qavion, Oct 11, 2020
    Sorry, missed this clue. I would focus on the driver's door light wiring. It sounds like both wires going to the light are shorted to earth.
     
    S F likes this.
  20. S F

    S F Karting

    May 13, 2016
    164
    Texas
    #20 S F, Oct 12, 2020
    thank you so much for this and the replies after. I’m going to look into the door lights first and work my way backwards. Thanks again for the diagram and tips!!
     
    Qavion likes this.
  21. S F

    S F Karting

    May 13, 2016
    164
    Texas
    #21 S F, Oct 12, 2020
    Solved!

    Turns out one of the leads on the passenger side door light housing had worked its way loose and eventually vibrated enough that it was in contact with the other lead, causing a short circuit.

    Image Unavailable, Please Login

    Feels really great to finally figure this one out and I wanted to say thank you to each and everyone in this thread that helped, especially Qavion!
     
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  22. Qavion

    Qavion F1 World Champ
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    #22 Qavion, Oct 12, 2020
    Great result, SF! Thanks for the feedback.

    I guessed the wrong door, but you got there eventually. I guess because both door lights are hooked up to each other, it could have been either door causing the problem.
     
    S F likes this.
  23. dbdreams

    dbdreams Karting

    Nov 6, 2003
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    Hayden, Alabama, USA
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    David W. Burnett, Jr.
    #23 dbdreams, Oct 12, 2020
    Awesome! glad you got to the bottom of it.
     
    S F likes this.

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