Question about Lowrance GlobalMap 3500C GPS Receiver

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Lowrance 3500 color map GPS

Unit will not power up. Voltage check indicates 12.5 volts to plug. Plugs clean. Unit was idle for several months. Removed unit from boat, and mashed power button dozen times, listening, and feeling for switch activation. Replaced power plug and activated power button. Unit powered up. Switched unit off, and have not been succesful getting unit to power up again.

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Not sure about these but try holding the on / off button in for about 30 seconds. The TOMTOM resets when you do this, maybe the 3500 does the same?

Posted on Sep 17, 2017


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Posted on Jan 02, 2017

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SOURCE: powerin up - screen goes blank after a few swconds -

had same problem. the cause was corrosion in the boat wiring. the power wire was corroded 95%thru. there was enough voltage to start the unit but when the sounder kicks in the voltage dropped below minimum and the unit shut off. took a LOOOONG time to find.

Posted on Jan 10, 2008

  • 13433 Answers

SOURCE: lowrance LMS 337

I wonder if the module has failed again, have you tried reseting the device?

I'm looking into this but I suspect that repairs are required again.

Posted on Jul 09, 2008

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SOURCE: lowrance 330c gps unit

A "soft reset" can be accomplished by pressing and hold "Pages" key and press and hold "PWR" key till USA map comes on , then release both. A "hard reset" requires press and hold both "Z in" and "Z out" buttons and press and hold "PWR" button releasing all three when USA map appears.

Posted on Oct 28, 2008

  • 1 Answer

SOURCE: Lowrance 250c map update

tring to get an manual for my system i left it and the glove dept. an a cari sold. thank you lowrance iway 250c .

Posted on Feb 13, 2009

  • 9 Answers

SOURCE: Lowrance LcX 27C

You need to get a MMC card for it to show Canada.

Posted on Jun 24, 2009

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Make sure that you have powered the NMEA 2000 network. The display unit's power cable has a set of red, black, and sheild wires that need to be hooked up to a 12VDC power source. There is a power diagram somewhere in the manual that should show this.

Make sure that you have the NMEA 2000 network connected properly. If it is a newer version LMS-525, it should just be a single 15ft cable that has two female ends, the module plugs into one end, and the other end plugs into the back of the display.
If it came with some T connecters and 120Ohm Terminator caps, then make sure you have that hooked up correctly. There should be a diagram in the manual for that as well but you just connect the two T's together like TT, put the 120Ohm terminators at each end, and run the extensions to the display and GPS module.

There is a decent troubleshooting guide for checking to make sure power is getting to the module at

If this doesn't tell you anything, most likely the GPS module is bad.You will need to contact Lowrance support to get it repaired/replaced. You can call them at 800-324-1356 or email them at

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All the best, Tony at KiwiGPS.

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Because Lowrance doesn't publish the pin connections, neither in their user guide, neither on a convenient website - this is really a breakpoint for me - I checked GPS connector suppliers and I found different plugs, type and connection codes in Europe, where information comes with the unit as a EU - norm

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Was working fine,then i get mess.gps module not responding ???

hi,your gps module-antenna is powered into 12 volt same as unit,have you traced your cable-fuses etc

May 20, 2008 | Lowrance GlobalMap 3300C GPS Receiver

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