Question about Magellan RoadMate 700 GPS Receiver

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No power to unit, but powers on okay in house with AC power adapter

So obviously it's the cigarette lighter adapter cable. But the cable has not been abused at all. The green light on the cigarette lighter adapter cable indicates that it is plugged in. Could it be a fuse if this light is on? The unit stopped working while plugged into my husband's old work vehicle. Ironically, when he plugged his iPod into the cigarette lighter, a fuse blew in that cable. And, we borrowed a Garmin GPS this weekend and plugged it into this same vehicle, and it worked fine for a while. But then it stopped working. It ran off of battery power for a while, so I know it must be either the cradle or the cigarette lighter adapter cradle. But I need to find out quick! So is it possible that the fuse is blown and that green light is still on? And on my Magellan, I thought it was the cradle, because when it first started acting up, it would turn off, but then I would play with it a little bit, and it would turn back on. Now it won't turn on at all. That doesn't sound like a fuse, does it?

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  • alwaysfixin Nov 13, 2007

    Update: I opened up the Magellan and the fuse appears to be fine. The little wire inside is not broken.

  • alwaysfixin Jan 08, 2008

    I bought a new cigarette lighter adapter on e-bay for $17 (including shipping,) and it's been working great ever since! Thanks.

  • alwaysfixin Jan 08, 2008

    And why would I throw away a $300 unit without trying to fix it first? I though that's what this site is for (people who want to fix things, not be told which one to buy instead.)

  • alwaysfixin Jan 08, 2008

    Thanks. I still don't know why the power cable failed, but I have a theory. I remove my GPS from my car on a regular basis to prevent theft. Most people probably disconnect the cradle from the unit, leaving the cradle and power cable behind (I'm assuming.) I always leave the cradle attached to the unit, and disconnect the power cable from the cradle, and leave just the power cable in the car. I happen to own an otoscope (the tool that doctors use to look inside the ear.) I used the otoscope to look inside the end of the power cable that attaches to the cradle and I saw what looked like a spring-loaded clip (I lack the technical terminology, sorry.) Anyway, I suspect that this spring loaded clip has exhaused it's spring, due to my continuous use. I could cut the thing open with a blade and look further, but I'm too lazy now that the thing is working. :)

  • eleigh1979 Feb 21, 2008

    My magellan wont stay on! I dont know what the problem could be!

  • LONZO1964 Mar 10, 2008


  • Ponchito Apr 12, 2008

    I found that the cradle is the problem when you loose power, the connector that you plug into is usually broken at the center pin. I just take the cradle apart and remove the pc board and unsolder the connector, then hard solder the cable with plug cut off to the circuit board. Remember to feed cable through plug hole on cradle half, and then I tie down the cable to the circuit board to relieve the strain on the soldered connection, put it back together- a little tricky, I find a loop magnifier very helpful. Hope this helps



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Not sure if you'll see this post, as you asked the question back in Nov, but I
thought I'd tell you what I know anyway.

I and my parents bought the same exact unit within a week of each other.
There's works, and mine does not.

I took their cradle, and hooked it to my GPS, and it came on, no problem.
I took my cradle, and hooked it to theirs, and boom, nothing.

So, with that, I was able to isolate that the problem is definitely in the cradle.

I went to the manufacturer website, registered my Magellan Roadmate 700,
and then I was able to contact customer support. I am writing to you as
I wait for their reply. Here's their website.

Hope this helps!

Posted on Feb 26, 2008


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Hello kdiltzbook,

Most GPS units can be charged three different ways:

1. Connection to a computer via USB port
2. Connection to a automobile via cigarette lighter plug
3. Connection to a wall outlet via an AC adapter

Typically most GPS devices these days include only the USB cord. Some GPS units also include the cigarette lighter plug. For most GPS units the cigarette lighter plug and AC adapter are optional accessories have to be purchased in addition to the GPS.

You don't mention which model of Magellan GPS you have so I am not sure which cords your GPS should have included. It sounds like you have the cigarette lighter cord and the USB cord? I am sure that Magellan has an AC adapter available for your GPS. You will want to contact them directly (their website is or visit an electronics store that sells Magellan GPS receivers (such as Best Buy™) to purchase the adapter.

However, most GPS receivers can be charged from the USB programming cord on the computer. However, ensure you are plugging the cord directly into a USB 2.0 on the computer itself NOT a port on a USB hub. (A USB hub may not output enough power to actually power and charge the GPS.)

You will also want to check and replace the fuse on the automobile plug.

I believe that both the USB and automobile cords should be charging the GPS. If neither adapter is charging the unit then the problem may be the GPS unit itself. The GPS may have a bad battery or problem with its charge circuitry. If that’s the case the unit may require factory service as the battery pack is generally not considered to be end user replaceable.

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Karen died

If the unit works on battery but not the AC adapter or cigarette lighter adapter, obviously the problem is in the adapter.

1. Have you verified that you have +12VDC at your accessory jack?

2. Have you checked the fuse in the cigarette adapter?

What are you powering it with when not on the battery?

- Jim

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Rwr supply

Buy an adapter such as the one in this link to convert AC power to a 12V "cigarette Lighter" outlet.

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