Question about Lowrance Iway 500c GPS Receiver

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Fuse Blows The GPS unit has an internal short circuit that blows the fuse whenever the power cord is attached to the unit.. The cords are ok as the LED lights up and stays lit when a fresh fuse is installed and the cord hooked to the power source but not to GPS unit. The fuse blows and the LED goes off as soon as the cord is plugged into the unit.

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Re: Fuse Blows - Lowrance Iway 500c GPS Receiver GPS Devices

Need a solution???????????

Posted on Dec 15, 2008

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Re: Fuse Blows - Lowrance Iway 500c GPS Receiver GPS Devices

Does the unit works at all?

Posted on Dec 12, 2007

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How do you get to and replace fuse in power cord for rand McNally 710 gps

Deborah, most of the time the fuse is in the cigarette lighter. The end unscrews. However, if that fuse blew, you may have wiring that has shorted. Much more common to blow you lighter fuse, in the car. Happens with plugging in and turning the "lighter" body, and shorting the lighter socket.

May 18, 2016 | Rand Mcnally GPS Devices

1 Answer

14 yr. old Land Rover. 8 yr. old GPS/stereo suddenly blowing fuses. Circuitry for radio memory, clock, internal lights & locks now no longer work. Head unit & AV controller unhooked & not the problem.

Disconnect all of the peripherals on the offending circuit. Then connect each, one by one, till the fuse blows. Voila - the source of your problem.

Dec 09, 2015 | GPS Devices

1 Answer

Garmin street pilot 330 charging problem


You need to check the fuse for both the car's cigar lighter AND the one in the GPS power plug (that goes into the cigar lighter outlet). Both must be good for the GPS to charge and power up.

I don't know if your friends cord worked in you car - or hers - so you're going to have to find out if it is the cord fuse or the car fuse. Since her cord worked on your GPS, start by using HER CORD connected to YOUR GPS in both cars. If it works in her car, but not in yours, check & replace your car's cigar lighter fuse. If or when it works in both cars, disconnect her cable and connect your cable to your GPS again. Connect into your cigar lighter. If it works, you're done. If it doesn't work, disassemble the plug at the end of the GPS cord (cigar lighter end) and check and replace the fuse if blown. You should be good to go at this point.

Please rate this reply if found to be helpful - good luck!

Jul 07, 2010 | Garmin StreetPilot C330 GPS Receiver

1 Answer

Humminbird fishfinder keeps blowing 5v fuses .Power ok to base but as soon as you attach fishfinder fuse blows


Most probable component that has gone bad and capable of blowing the 5V fuse would be:
  • voltage regulator IV or transistor;
  • reverse protection diode;
  • zener diode;
  • shorted capacitor.
As the 5VDC normally supplies the logic circuitry, perhaps diagnosis and tests should be focused within that area.

Hope that this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Oct 24, 2008 | Humminbird GPS Devices

1 Answer


Hello KTFORE1,

The Street Pilot 330 comes with both a vehicle power cord and a USB cord for connecting the unit to the computer. If I understand you correctly the GPS isn't getting power from the vehicle power cord. Does the GPS charge if connected to a computer using the USB cable? If so the problem is likely the power cord or cigarette lighter socket you are using. If the GPS doesn't charge from USB port on your computer then the problem is likely the GPS itself.

If you determine that the cable is the source of the problem, check and replace the cable's fuse. You will probably also want to check and replace your vehicle fuses as the circuit that powers the cigarette lighter might have a blown fuse. If replacing the fuses doesn't solve the issue then you might need to replace the power cord.

Best Regards.
"Go Ahead. Use Us."

Jun 30, 2008 | Garmin StreetPilot C330 GPS Receiver

1 Answer

Nuvi 650

Hello Grumpa1350,

There are several possible reasons why a GPS unit might not turn on. For example, there could be something wrong with the charger such as a blown fuse, bad power adapter, or defective cable connection. The internal battery inside of the GPS also might be defective or worn-out. Or, worse yet, the unit may have a more serious hardware fault.

You don't say how you are charging the unit. I'd recommend trying a different charge method. The GPS can be charged one of three ways: connection to you car via the automobile power cord, connection to your computer via a USB cable, or charging from a wall outlet using an optional AC adapter. If you are charging the unit in your car, try connecting it to your computer (or vice versa). If the GPS turns on after being charged using one method but not the other, then that pretty much tells you that the problem is with the cable or adapter being used for charging.

The Garmin NUVI 650 does not contain an internal fuse, but there is a common 3 amp fast-blow fuse located in the vehicle power cord. If you find that the problem happens when trying to charge the unit in your vehicle, then you should change this fuse and see if that corrects the issue. The fuse can be replaced by unscrewing the black round piece at the end of the cigarette lighter plug.

If the unit does not turn on regardless of what charge method you use, then the fault is likely with the GPS itself. Either the internal battery would need to be replaced or the unit would need to be serviced to correct whatever hardware fault is causing the problem.

I would recommend you contact the manufacturer before you attempt to open up the unit. Opening the case of the GPS may void your manufacturer's warranty (if the unit is still under warranty).

Best regards,
Go Ahead. Use Us.

May 14, 2008 | GPS Devices

2 Answers

Installation / wiring

Yes, you can do what you said above. The only issue I see is that you should still add an inline fuse between the GPS and the power source you will be connecting it to.** SEE NOTE BELOW **
The cigarette lighter plug has a fuse in it. Most of the fuses you have in the car start at 5 Amps and go up in value, like 10A, 20A, etc.

The problem is these values are way too high should the GPS have a catastrophic failure or the GPS power leads get pinched or shorted to ground. You'll burn up the GPS and its wiring before the auto fuse blows.

You need a low rated fuse (probably 1/4A) inline with the GPS. This will give you adequate protection. You can buy inline fuse cords at Radio Shack.

** NOTE **
Check to make sure that the DC output of the cigarette adapter is indeed +12VDC and not some lower voltage indicating that there is an internal regulator circuit. I took a look at the 660 owners manual and it says the GPS input voltage is +12VDC, so you should be ok. I also hear there is some electronics inside of the cigarette lighter plug. It may have to do with charging the internal GPS battery. You could always take apart the cigarette plug and remove the internal board and use it in your hard wiring to your vehicle.

Once you get it all working, you could duplicate what you built for another vehicle. You can buy the cigarette adapters online.

Please let me know if I can be of further assistance to you.

Good luck!
- Jim

Feb 13, 2008 | Garmin Nuvi 660 GPS Receiver

3 Answers

Magellan Roadmate 760

The cord for the roadmate 760 takes a 3 amp 250 volt fast blow fuse.

Feb 09, 2008 | Magellan Roadmate 760 GPS Receiver

2 Answers

Magellan roadmate 300 wont turn on!

I think the problem is with the internal power jack which tends to break. the part is MG361213 and is available at You have to take the Unit apart and remove the old jack and resolder the new one which is a three pin unit.

Good Luck

Nov 30, 2007 | Magellan RoadMate 300 GPS Receiver

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