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Thread: m2-atx doesn't survive crank, used to. why?

  1. #1
    Constant Bitrate
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    Angry m2-atx doesn't survive crank, used to. why?

    This is really annoying!! My m2-atx was working fine, but occasionally it reboots during crank, in a brand new forester xt06.

    Any ideas? This seems to occur for a while, then for no reason it starts working fine again and survives the crank.

    Is the damn thing faulty?

    I put a DMM on the terminals of the pc during crank and the voltage dropped, but not very much. Can't remember exact amount, but it wasn't below 11v from memory.

    Thanks for any help

    Cheers
    Jamie

  2. #2
    Confusion Master
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    Battery voltage is too low.


    could be the battery on the way out or just drained at that time. Take it out for some long drives to chargew it up.


    I had/have the same with my inverter, it normally survives the crank no problem but if the battery is quite low it doesn't.

  3. #3
    Constant Bitrate
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    The battery should be fine, the car is only 3 months old, almost.

    But you might be right. I will measure the voltage drop during crank today.

    The qustion is, how low is too low? I thought in the manula it said it could survive down to 9v or something during crank???

    Who makes these PSUs? I would like to contact them direct

    Cheers
    Jamie

  4. #4
    Maximum Bitrate psyrex's Avatar
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    My car drops down to around 3v during crank even after a nice long drive. While mine is pretty low, dropping to less than 9v for most cars is not unusual.
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  5. #5
    Self proclaimed spoon feeder TruckinMP3's Avatar
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    Take the car to a parts store that will to a free charging system diag test.

    It will tell you about the health of your: battery, alternator and voltage regulator.

    It takes about 5 minutes and will help you answer your question.

    Even 3 month old batteries can be bad, though it can be caused by another part of your charging system or too much drain.
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  6. #6
    Constant Bitrate
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    OK just tested the battery during crank. It goes down to 9.12V. Its 12.03 after sitting in the shed all night. 14.++ while the car is running.

    The m2-atx manual states it can handle down to 7volts during crank. Not getting anywhere near that.

    After all this now the damn thing works again.!!! It worked after sitting all night, but it won't work after I drive the car for 20 min, which should charge the battery right up.

    Hmm, starting to think this is just a faulty POS.

    So, who produces these things?? Anyone know? I bought it from MP3car.com, but I would rather deal direct with the manufacturer if I can.

  7. #7
    Self proclaimed spoon feeder TruckinMP3's Avatar
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    if it is bad after driving go get your car tested. You may find something in the charging system is broken.

    Do this before you get stranded.
    TruckinMP3
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  8. #8
    Maximum Bitrate
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    I'm betting my money that your cables are too thin or too small.

    A good amount of ampere needs to run to compensate for the drop in voltage.

  9. #9
    Maximum Bitrate JimmyFitz's Avatar
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    Chances are that there is something wrong with your cars' charging system and the CarPC is not at fault, but it is more sensitive to the voltage drop. Check your connections to the battery. If any are loose or corroded that could cause this. Wiggle the wires leaving the battery and follow them to the other end and check there too, especially where the ground wire goes to the chassis.
    ~Jimmy

  10. #10
    Maximum Bitrate MobiTekLink's Avatar
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    Check the wiring and make it as short as possible and w/ heavy gauge (at least 10g) . I've had my system for 1 1/2 yr and never had a failed crank since I used good wires. I also have a yellow top optima
    08 Lincoln Navigator www.mobiteklink.com

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