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  • fuse blowing

    Got a problem here I haven't been able to figure out. I've had my computer in the car since August with no problems at all. There's an in-line fuse holder attached to the power wire with a 10 amp fuse, and like I said it had been running great since Aug. I haven't made any changes to the car or setup since I installed it. Then out of the blue on Friday, it started blowing in-line fuses. I try replacing the fuse, and as soon as the ciruit is closed, the fuse blows (car is turned off during this). I've replaced the power, ground, and remote wires, but nothing. Could my M2-ATX power supply be going? Anybody have any other ideas?

  • #2
    i had a similiar problem. Turned out where i made splice to lengthen the main wire from the power supply to the battery, i used a butt connector. It got wet, corroded, and broke in half and was shorting out on the floor under the carpet.
    G945GLCF2 | 512MB RAM | 160GB HD | Holux GPS w/ Routis | XMPCR w/ TOSLINK mod | Audigy 2 NX | | Xenarc 700TSV |Opus 150W PSU.

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    • #3
      Have you tried it removing the mobo (all of the load removed) connections from the M2ATX and seeing if you still blow a fuse. If it does (blow) and your inputs (Batt,ign,gnd) are good, its the P/S.

      I agree with #2, lift both end connections of the batt wire and check resistance to ground
      It's been a while...

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      • #4
        Thanks for the suggestion h3rk. I haven't thought/tried that yet, but will do so this afternoon. My gut feeling is it is the power supply b/c I've replaced all the power/ground/remote wires and connections (including battery connection). One thing I forgot to originally mention is this problem began when I was towing my boat. Could having the trailer lights hooked up have caused some kind of problem?

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        • #5
          I solved my fuse blowing problem, but have yet to figure out exactly why they were blowing. I took the advice from above and unplugged the motherboard from the power supply then reconnected the power wire. The fuse did not blow when I did this. So I reconnected the motherboard to the power supply, conncected the power wire, and the fuse did not blow. Finally, I connected the DVD Rom and to my surprise the fuse once again did not blow.

          So I no longer have fuses blowing, but I have no clue what was causing my problem to begin with. Guess I won't complain too much though seeing as how everything's working fine right now.

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          • #6
            Somethin in ur puter is pullin too many amps....sometimes. Just a guess, but I'd say HDD. As they get older they can increase is load demand.
            It's been a while...

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            • #7
              So why would it work now if it didn't before? Curious because I'm blowing fuses left and right as we speak. All of my connections are good though.

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              • #8
                My guess is that since our "von Neumann" or "Princeton" computer architectures are wonderful multiplexed machines, what is pulling too much current is not always on, and the overall current is probably not caused by one sole offender. And not all conditions that cause currents to rise above normal levels are constant. Bearings and motors (HDD) will have different currents at different temperatures, just as one example.
                It's been a while...

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                • #9
                  so what am I gonna have to do to fix this then?

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                  • #10
                    Hmm, I think mr Harvard will give just as much problems in his own way
                    But it certainly doesn't hurt to eliminate troubles by disconnecting them. Just make sure you have a pile of fuses ready...

                    You can also try a one-step larger fuse; so if you have 10amp now, try a 15amp one. If there's a shortcut then it will blow anyway. But if it's a slight overload then it will remain.

                    white bream
                    working on a trilogy: CARGO - UNIGO - MERGO
                    CARGO = the Car Computer
                    Intel Celeron M, [P]SDC, uBlox GPS, GPRS, WLAN, Silabs FM, RDS, TMC,
                    Dual-audio, Onecable TFT, Microsize: 45 x 108 x 168mm (1.8 x 4.3 x 6.6")

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                    • #11
                      I'm using two 20 amps. I have one 20 amp on an inline fuse from the battery to the DSATX, and there's one on the DSATX itself.

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                      • #12
                        I think selectively disconnecting loads and running the puter for a while to see if fuse does not blow is the best bet (hopefull you'd have a spare new, and perhaps smaller HDD with an OS loaded?)
                        It's been a while...

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                        • #13
                          I have two hard drives - one is a 20 gig laptop hard drive that holds the OS, and the other is an 80 gig 3.5" for the media.

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                          • #14
                            first thing I'd do is disconnect your media drive and see if the copper-carnage ceases to continue.
                            It's been a while...

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                            • #15
                              I'm still not 100% sure why mine kept blowing, but the end result is both of my hard drives (40 gig laptop) are dead. I still have no clue what was causing the fuses to blow. I'd replace a fuse and as soon as the circuit was closed, it would blow. The weird thing was this was happening without the car or computer being turned on. And like I said, it just started out of the blue Friday while I was towing my boat (I have towed the boat before though without problems).

                              Perhaps the hard drives were going bad and causing the fuses to blow. But, would a hard drive going bad cause a fuse to blow even without the computer and/or car being powered up? Also, what're the odds that both hard drives were going bad at the same time?

                              From my testing I'm pretty sure that the power supply is still good. When I get some free time I'm gonna hook the computer back up in the car (without hard drives) to see if it has really stopped blowing fuses and see how things operate.

                              Overall, still puzzled by this.

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