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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Re: Identify Bulkhead Plug

Here is the link for the manual if you need it; page 59 has a wiring diagram which i guess you may have seen check this link - these guys seem to have the right ones Hope this helps :)

Posted on Mar 15, 2007

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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:

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

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6 not used
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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 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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