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Re: my interswitch pin is missing
What is an interswitch pin? Never heard of any such thing on a C550. And the only way to unlock a PIN locked Garmin is to enter the correct PIN number or take the unit to the location at which the PIN was initially set. Your only other option is to send the unit to Garmin.
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As you have isssues with boyh software update and chart I would put my bet on the cartridge reader, it could be a loos or broken pin. Use a penlight or good light and inspect the pins in the reader for damages and check that there is no pin stuck in the Navionics cartridge. If no pin is missing it may just be loose, can be fixed by opening the plotter inspect the reader from behind and use a glue gun to resecure the pin(s). In worst case you will have to replcae the reader (affordable).
The colours vary from country to country. In the UK and Ireland the colours are Brown = Live, (Goes to the pin connected to the fuse, on the right if the longer, earth, pin uppermost) Blue = Neutral (Goes to the pin on left if longer, earth, pin is uppermost) Green and Yellow = Earth (Goes to the longer pin)
In the USA and Canada Black = Hot (Goes to the pin on right when the long round,earth, pin is nearest the floor) White = Return and (Goes to the pin on Left when the round, earth, pin is nearest the floor) Green = Earth (Goes to the longer round pin)
Eloise, did you ever find a solution to this problem with yur Garmin? I have the same problem and don't want to spend $40 for an entire mount. Let me know, you can email me at JeffWang3@gmail.com. Thanks!
Check the pins at the connector on the back of your unit. Make sure one of them is not bent or broken off. One of the pins on mine is missing about 1/16" of the tip. My boat repair shop says it's the power lead, but Garmin wants $200 for a generic repair.
guys: book says:
PIN 1 (red) 10-40 volts DC
PIN 2 (black) Ground
PIN 3 (blue) NMEA out Shows this goes to Autopilot/NMEA devise and to RXD positive RXD negative goes to ground (black)
PIN 4 (brown) NMEA in Goes to GBR 21 Beacon Receiver to a blue wire, brown wire on thaat devise goes to PIN 3 and the negative goes to ground
PIN 5 (white) no connection
PIN 6 (Green) no connection
PIN 7 (yellow) goes to alarm low Shows going to negative terminal on alarm relay and positive terminal goes to PIN 1 (red)