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Thread: Garmin 18 problems, please help

  1. #1
    Constant Bitrate studmonk3y's Avatar
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    Garmin 18 problems, please help

    Just bought a garmin 18 PC unit. Has a serial connection and takes it's power from a cigarette plug adapter. It's rated to take an input voltage of 8-30v and input current is 50mA @ 13.8v. I chopped off the cigarette plug, there's a red (voltage in) and black (ground) wire. I soldered the red to the yellow wire and black to black on a molex connector so it should be getting 12 volts. But now I can't get anything to find it on the com port. Tried using hyperterminal and this garmin configuration tool I d/l from their website. Spent a good hour on the phone with garmin tech support changing port settings, numbers, etc, still no luck. It will not recognize it on any of the ports. Running out of ideas, can anybody provide some suggestions?
    Thanks,
    James

  2. #2
    Constant Bitrate GRUNT's Avatar
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    Try Powering it from a harddisk power connector.
    See if that makes any difference.

  3. #3
    Constant Bitrate studmonk3y's Avatar
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    Quote Originally Posted by GRUNT
    Try Powering it from a harddisk power connector.
    See if that makes any difference.
    dude that's what i'm doing already

  4. #4
    Constant Bitrate GRUNT's Avatar
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    You say you have used the "molex" connector.
    I though, you had used power connector to the mother board?

    Try using an other power source!!

  5. #5
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    Garmin 18

    All the Garmin 18's, that is the bare wire version, the USB version, and the PC, with a cigarette lighter adapter and com port adapter run on 5.0 volts. There is no way Garmin could design the unit to have only a USB connector, and have it consume 12 volts. USB voltage is 5 volts. All the Garmin 18's are exactly the same except for wire termination.

    Inside the cigarette lighter adapter, if you would have opened it up, is a printed circuit board, with a big, giant resistor to dissipate the voltage over 5 volts as heat. Since the unit runs on some ridiculously small current, like 200 mA, the resistor in the cigarette lighter adapter doesn't melt the plastic case.

    The unit is probably toast, but if no smoke came out there may be hope. You can take an ordinary USB cable, and cut off the end that looks like a little house, and leave the cable attached to the end that goes into a computer chassis only. There are four wires inside. The red and black are for power. USB doesn't supply much power, but it is the proper voltage and sufficient current to power a Garmin 18 OEM GPS unit. You don't need the other wires in the USB cable, so just chop them off.

  6. #6
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    All the Garmin 18's, that is the bare wire version, the USB version, and the PC, with a cigarette lighter adapter and com port adapter run on 5.0 volts. There is no way Garmin could design the unit to have only a USB connector, and have it consume 12 volts. USB voltage is 5 volts. All the Garmin 18's are exactly the same except for wire termination.

    Inside the cigarette lighter adapter, if you would have opened it up, is a printed circuit board, with a big, giant resistor to dissipate the voltage over 5 volts as heat. Since the unit runs on some ridiculously small current, like 200 mA, the resistor in the cigarette lighter adapter doesn't melt the plastic case.

    The unit is probably toast, but if no smoke came out there may be hope. You can take an ordinary USB cable, and cut off the end that looks like a little house, and leave the cable attached to the end that goes into a computer chassis only. There are four wires inside. The red and black are for power. USB doesn't supply much power, but it is the proper voltage and sufficient current to power a Garmin 18 OEM GPS unit. You don't need the other wires in the USB cable, so just chop them off.

  7. #7
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    Quote Originally Posted by AwesomeMachine View Post
    All the Garmin 18's, that is the bare wire version, the USB version, and the PC, with a cigarette lighter adapter and com port adapter run on 5.0 volts. There is no way Garmin could design the unit to have only a USB connector, and have it consume 12 volts. USB voltage is 5 volts. All the Garmin 18's are exactly the same except for wire termination.

    Inside the cigarette lighter adapter, if you would have opened it up, is a printed circuit board, with a big, giant resistor to dissipate the voltage over 5 volts as heat. Since the unit runs on some ridiculously small current, like 200 mA, the resistor in the cigarette lighter adapter doesn't melt the plastic case.

    The unit is probably toast, but if no smoke came out there may be hope. You can take an ordinary USB cable, and cut off the end that looks like a little house, and leave the cable attached to the end that goes into a computer chassis only. There are four wires inside. The red and black are for power. USB doesn't supply much power, but it is the proper voltage and sufficient current to power a Garmin 18 OEM GPS unit. You don't need the other wires in the USB cable, so just chop them off.
    Or try connecting it to your carputers 5 volt supply.

    Michael
    ...I love the French language...especially to curse with...Nom de Dieu de putain de bordel de merde de saloperies de connards d'enculés de ta mère. You see, it's like wiping your *** with silk, I love it.

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