Question about Garmin GPS 126 GPS Receiver

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Identify Bulkhead Plug

I've got a Garmin 126 GPS on the bench at the moment with pin 1 on the main connector corroded to the point where it has broken off completely. Since this pin carries power to the unit, that's bit of a problem for me. Does anyone know what series this seven pin so-called-waterproof bayonet locking bulkhead plug comes from ? Thanks, A.

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  • Alastair Macleod
    Alastair Macleod Mar 15, 2007

    Thanks - the link to LTW looks particularly promising.

    A.

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Here is the link for the manual if you need it; http://www.garmin.com/manuals/82_OwnersManual.pdf page 59 has a wiring diagram which i guess you may have seen check this link - http://www.ltw-tech.com/c.php?idc=1&cs=&ms=&cb=&as=&task=part these guys seem to have the right ones Hope this helps :)

Posted on Mar 15, 2007

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Hi - check power is getting to the plug at the GPS socket. Use a voltmeter or bulb to check the pins 1 and 2 - these are the first 2 hole on the clockwise side of the notch in the end of the plug.

Positive is the first. Negative the 2nd hole.

See Garmin diagrams here: http://www8.garmin.com/support/faqs/faq.jsp?faq=68

If there's power there then you'll have to undo the screws on the back to have a look for any obvious faults but these are pretty robust machines so I'd be picking your cable is suspect first.

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Hi - I have a Garmin GPS 126 in bits on my desk ready for a new cable as the socket in the back has some broken pins.

Also refer to the Garmin GPS to PC Wiring Instructions here on the Garmin site: http://www8.garmin.com/support/faqs/faq.jsp?faq=68

The internal 8 pin white connector on to the back of the circuit board is as follows:

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All the best, Tony at KiwiGPS, New Zealand

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1 Answer

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Could be worth a look at the connector on the back of the unit itself. As I discovered a few weeks back, they aren't as saltwater resistant as the IP67 rating would lead you to expect. Compare the pins in the plug with the diagram on page 99 of your manual (also downloadable from http://www8.garmin.com/manuals/GPSMAP198CSounder_OwnersManual.pdf) and make sure all the pins that are supposed to be there actually are. In particular, make sure pin 15 is in a decent state. This one carries power to the unit, but will act as a sacrificial anode in the presence of saltwater, and can rapidly corrode to oblivion. If this is what has happened, you have a bit of a problem, because Garmin, don't appear to be very good at making spares available. I was lucky in that the GPS I was fixing was a lower end model that only used five of the seven pins in its connector, so I was able to rewire to provide a supply through the unused pins. The diagram suggests that the 198C also sports a few unused pins, so you may well be in luck. A.

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