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Old 09-21-2018, 08:40 AM   #1
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Garmin RV770

Just bought a new Garmin RV770 LMT-s which I am very happy with. However it did not include a 110 adapter with it. I called Garmin and got no help in finding one. The suggestd to plug the unit in my computer with the provided cable. That did not work. I went online and hopefully found a compatible ac adapter. Haven't received it yet but hope it works. Has anyone had a like problem and found a solution.. I find it hard to believe that Garmin does not have an AC adapter that is advertised to work with the unit. I guess they don't understand that we like to plan a trip in the house before we take off. I must add that the unit is great and easy to use.
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Old 09-21-2018, 09:13 AM   #2
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Had the same issue. We have a multi usb charger we use in the S&B. Works better when you have the higher amp out 110 / usb charger.

Our multi one has different outputs so works best on higher rated. Found better usb cable and specific USB port on my laptop will charge also.

Love the unit too. Just had to find the right spot to mount in our class c to get the gps satellites reliably
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Old 09-21-2018, 09:54 AM   #3
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I've never heard of an AC adapter for a GPS. We have the RV660. A couple of things to keep in mind. You can download "Base Camp" from the Garmin website and use it for planning. Use the USB cable Garmin provided with the unit to upload the trip to the 770. We purchased a beanbag mount for the GPS which works well on the dash of the MH. I learned about this mount when I had the boat and used "Blue Charts" with it.

Also know that Garmin pulled the map update due to inaccuracies in bridge and overpass heights. The update is due out in October.

Our unit does some whacky stuff on the I-10 in Phoenix. It makes us exit and U Turn near the AZ State Fair for some reason.

Hope this helps.
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Old 09-21-2018, 12:02 PM   #4
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Just plug the USB cable into just about any cell phone charger instead of the computer, and it should charge/power the Garmin when at home. I currently have a Garmin DriveSmart 61, but that method has worked with every Garmin I have ever owned. Any USB charging or data cable should work assuming it has the correct USB plug to plug into your Garmin. Some Garmin's have a Mini B plug like my current unit, and others have a Micro B like my last one. (And a USB Type A on the other end to plug into the charger.)

When you plug the USB cord into a computer, the unit likely defaults into the data transfer mode, to transfer data instead of charging. Mine does, and it won't charge when plugged into the computer. Garmin should know that.

The USB standard voltage is 5 volts. I don't know the amperage requirement of the specific Garmin, but 0.5A (like most basic chargers) is probably sufficient.
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Old 09-21-2018, 01:38 PM   #5
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You can use a AC to DC adapter
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Old 09-23-2018, 08:27 PM   #6
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Just out of curiosity, why do you need to be able to connect it to 110?
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Old 09-23-2018, 08:44 PM   #7
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One word of advise. I fried a Rand McNally by thinking I had a 110v charger....it was black, and the plug fit, must be the charger, right.....WRONG.
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Old 09-23-2018, 08:47 PM   #8
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P.S. I recently had a long tooth stereo installer do some electrical wiring in my coach. I ask him to direct wire the gps. He looked at the big plug, read the specs and said no way. The plug is also a transformer, you wire it direct it will burn it up.
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Old 09-24-2018, 06:54 AM   #9
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Quote:
Originally Posted by HamboneTHW View Post
Just out of curiosity, why do you need to be able to connect it to 110?
I like to do my research at home with reference mater at hand
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Old 09-24-2018, 11:53 AM   #10
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Quote:
Originally Posted by DGBPokes View Post
The plug is also a transformer, you wire it direct it will burn it up.
Applying 12 volts to a 5 volt circuit will do that!!

But you can hard wire in a 12v to 5v voltage regulator. They are readily available. I did that to charge the Windows tablet I use for Silverleaf VMSpc.

Back to the OP. I often want to use my GPS at home to check out different routes, look up and save POI's as favorites, etc. The battery alone is usually sufficient for that purpose. But some units have less battery capacity than others. But Garmin's will run/charge using USB power. No 120v charger adapter is necessary, which is why Garmin doesn't appear to make one. There are literally hundreds if not thousands of USB chargers out there that will work for this purpose.
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