Question about Magellan RoadMate 300 GPS Receiver

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Won't Power from Cigarette lighter

I cannot get power once the unti is mounted and plug into the car power jack. Could it be anything other than a bad power adapter?

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Recently I had a similar problem with my 300 - worked fine with AC power, but was intermittent with the power point in my truck sometimes it wouldn't power up at all in the truck).

I used a small nail file (steel wool would work too) to break the "glaze" on the outside of the small plug that plugs in to the unit on the power cord. It seems that it wasn't getting a good ground. Has been working great ever since - worth a try.

Posted on Feb 09, 2008


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I bought a Nexxtech 175 watt inverter to power my laptop. It worked fine in my truck in the store parking lot but won't work in my tractor where I really need it. It works from the power point or the...

It could be any of a number of things, but the first 2 guesses I am going to make are:
1) The contacts in the cigarette lighter jack in the tractor are corroded; or
2) the wires that power the cigarette lighter jack in the tractor are too small of a gauge to provide enough current flow without a voltage drop. This one can be tested by popping the cigarette lighter jack out of the dashboard while still wired (carefully, you don't want to cause a short-circuit), and then plugging in the inverter and measuring the voltage with a multimeter going INTO the lighter jack. It should be at least 11.5, preferably 12, Volts. Test both before and after the inverter is plugged in. If the after reading drops too much, then you know you need a bigger gauge wire feeding the lighter jack.

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'93 Jeep won't start - used cigarette lighter for gps instead of power socket

Sounds like a bit of a stretch... (nah).

"Lighter" is a GREAT OUTLET...
Has been for decades.

Perhaps it is just time to consider some BATTERY MAINTENANCE... cable and terminal cleaning
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I ASSURE you a cigar/cigarette lighter ELEMENT
pulls a lot more power than your Garmin Nuvi 1450LMT.

Get your JEEP battery checked...!!

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My accessory plugs don't work but the cigarette lighter does

sounds like the power end of the GPS is faulty.

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It doesn't power up

There is a small power button at the base of the device. No offense, but are you sure this is still pushed in to the "on" position?

Also, I have the same device, but I did blow my fuse. However, I lost it and cannot remember the number on the fuse. Would you be willing to post the fuse replacement part number for me?

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How do you get started... where do you plug in the gps in my toyota avalon? I have a 5045

Hello, If i understand correctly, you are just trying to set up your Magellan gps into your Toyota Avalon. First of depending on the kit you got for the bracket to hold the unit, it normally will have a suction cup, that secures the bracket, put the bracket on the window, normally to the right of driver view and toward bottom of window, then after putting mounting (suction cup and gps holder) on window, then mount gps in to bracket, now your gps is mounted at this point on window. Now, of course you have to plug it in. GPS kits when you buy them normally have a 110 power plug ( to plug into home outlet) and some will have with the kit, a 12 volt cigarette type of plug to plug in your car (which is 12 volt power) In your home of course you can charge the gps off your 110 power, and gps will run off internal battery for a few hours, but you will find out like with mine, that your better off to plug into car for power, because the internal battery does not last very long. I have a Magellan as well, and they are great units. NOW this being said, if you did not get with your gps a 12 volt car adapter for your gps, you will have to get one. ( unless you have a power converter, which takes 12 volt and converts it to 110 power, but that's another story and only recommended for devices that do not have 12 volt adapter capabilities)

In conclusion if you have the 12 volt adapter to plug in your gps, all you do is find your cigarette lighter, take out your cigarette lighter, put in glove box for storage, and plug your gps in your cigarette lighter, or any other 12 volt cig lighter plugin. That's all there is to it, and now you have power running off your car. Thanks mike , hope this helps

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It sounds like you have a bad charging cable for the GPS or the cable is overloading the cigarette lighter.

The cigarette lighter is designed for less power then a 12v power outlet.

Therefore it is easy to blow the fuse for the cigarette light if you install something that draws too much power.

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Bad idea. The wiring leading up to your cigarette lighter is usually a cheap 16 gauge wire. The amplifier will not be able to draw enough amperage through that power source. You could however, use the positive on your cigarette lighter as your remote for the amp. This would be helpful if your cigarette lighter turns off and on with the car.

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Check ALL the fuses. pull them out an dlook. Also repace the one that is power for the dash/rradio/etc... even if it looks good.
If that doe snot fix it then pull the lighter out and test the wire going to it for power. If it has power then you might have a bad plug/ground. Replace outlet if so.

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To charge a nuvi, use one of the following methods:
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  2. Connect the USB cable to the nuvi and the computer. The computer will charge the nuvi as long as the computer is on. However, the unit will be in Mass Storage Mode and normal operation is not possible.
  3. Connect the AC power cable and the nuvi to a wall outlet.
Please note: All of the nuvi series will come with a suction cup mount and vehicle power cable to charge the nuvi. However, only some of the nuvi models will come with an AC power cable and/or USB cable. If they did not come with the nuvi, they would be optional cables and would be a separate purchase. Garmin only recommends using an AC power charge that is purchased from Garmin. Third party power cables may not charge the nuvi. These cables may be purchased from Garmin or Garmin's dealers.

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