gps not working - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics
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Old 06-16-2009
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gps not working

trying to wire up my gps,
will work off the boat but not on the boat?
i am stumped.
red wire to 12 volt supply....
black wire to ground correct?
why will it not work? any ideas?
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Old 06-17-2009
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Breaker switched on? Blown fuse? could be almost anything.
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Old 06-17-2009
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It would help if you said what GPS unit and what boat you had, as well as how the GPS is wired on the boat. Posting a wiring diagram wouldn't hurt either.
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Old 06-17-2009
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I have 2 mounted with boat power, Raymarine 630 and a Garman 45xl. I installed an external antenna for the 45 which helped to improve the accuracy. I used a light bulb with leads and a diode to verify power prior to hooking up. The diode only conducts in one direction which verified that the white was hot and black was the ground. One could assume red to be 12 and black ground, but it could have been wired incorrectly. Need to confirm continuity and polarity with a volt meter or with a simple rig like I made.
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