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  1. #1
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    Default 65LM overheats?...quits charging?.....where antenna located so can add reflective foil?

    I am trying out a Nuvi 65LM on a motorcycle. Original Garmin socket mounting. Power is from the motorcycle's battery, via a 12 volt to 5 volt USB adaptor, & it with the Garmin cord works fine.

    After something from 3/4 to 1-1/2 hours, the charging quits, then the GPS battery runs down fairly quickly since it has to be set for rather high brightness to see it......but the power adaptor is OK.
    Garmin's literature implies that at or above 113 degrees F. inside the 65LM, it cannot be charged. I suspect a temperature sensitive circuit was used for to protect the battery from having a serious problem.

    I think the answer MIGHT be to glue bright aluminum foil or insulated aluminum foil on the entire rear of the unit so the sun's rays are reflected. However, I don't know where the antenna inside the case is located, and don't want to reduce the sensitivity to the satellite's signals very much.

    Anyone have this problem and solved it....OR?

    thx
    Rob

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  3. #2
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    Based on personal experiences with using Garmin auto GPS units while motorcycling:

    1) The biggest issue I've found is vibration. The power adapter's USB connector to the GPS unit, and/or the power adapter's cigarette lighter connector tends to loosen and even get disconnected. The soldered connector inside the GPS unit also will eventually be broken causing intermittent contacts--at best, charging issues, and at worst, slightest bumps on the road cause the GPS unit to power OFF and reboot randomly. BTDT... a real PITA. Secured the entire power adapter cable--both ends--tightly with zip-ties so that vibration effects are minimized.

    2) Heat shouldn't be an issue when using on a moving motorcycle, there should be constant air flow cooling the GPS unit--even when mounted behind a windscreen. I've never encountered any problem while using on a motorcycle but I've actaully seen heat problems when GPS unit is used inside an auto, mounted on the windshield atop of the dashboard--permanent white lines begin to form on the touchscreen.

    Your situation may be different, but this has been my experience, FYI.

  4. #3
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    It is definitely not a connection problem, we knew about that potential long ago. There is no appreciable vibration in our installation either.

    There is no air moving behind the windshield that is directed onto the GPS. I intend to put a thermometer onto the case of the GPS. Should I find that temperature exceeds Garmin specifications, then I will have to find a way to get air to the unit, OR, ...::

    My question remains: Where is the antenna located inside the case (so I can know if I can cover the rear of the case with reflective aluminum.

  5. #4
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    Default

    Quote Originally Posted by Snowbum View Post
    I am trying out a Nuvi 65LM on a motorcycle.
    Firstly, 'horses for courses'. I agree fuly with tli in that an auto unit is always going to be problematic on a MC not only for the reasons he stated, but also due to their lack of weatherproofing. Any moisture penetration can be devastating, even just a minute amount of water when wind-driven at highway speed. I know you've been told what you're not asking, but those things are important. It's possible your problem is not to do with temp but with adequate charging current.

    Original Garmin socket mounting. Power is from the motorcycle's battery, via a 12 volt to 5 volt USB adaptor, & it with the Garmin cord works fine.
    You've got me confused on that. 'Original Garmin socket mounting': Does that mean you're using the supplied power lead with a ciggy plug? If so, it's contradictory when you say you're charging with a 12v to 5v USB adapter and 'with it the Garmin cord works fine'. How can it if you have the 'Garmin cord' running off 5v? It's 12v in and 5 v out and can't charge the unit if you've connected to a 5 volt source. Alternately, if you're using a 5v USB charging lead from the 5v USB adapter directly to the unit's usb socket, the 12v to 5v adapter needs to be 1amp output minimum, preferably 2amp.
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  6. #5
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    I'll try to clear up the confusion for you. The original Garmin socket mounting means just what it says...has nothing electrical in it at all, it is the Nuvi mounting; which is NOT motorcycle vibration-proof, and easily will disassociate from vibration....but I modified it, and it is solid. I adapted a RAM mounting item to the Nuvi.

    There is NO contradiction about the electrical supply. The supply is capable of 3.3 amperes....that is vastly more than the Nuvi actually draws from a vehicle battery. The genuine Garmin cord (with its internal resistor) plugs into the Nuvi, and then plugs into the adaptor...in this case, the German plug type (Hella-DIN), which is the German motorcycle version of what in USA is called a cigarette lighter socket.
    The Adaptor was tested to be working correctly, using a resistive load that provided 2.5 amperes of drain from the adaptor.
    I am no dummy about electricity.
    I simply want to know where the antenna is located, so I won't shield it if I put aluminum foil on the back of the Nuvi 65LM case.
    At this point, it appears I may just have to open the case and take a look at what is inside....and, perhaps run temperature testing on the Nuvi to see where it signals charging shutdown.

    thanks for the help

  7. #6
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    This is what the guts of the 65LM looks like:

    eXA2aGDUBv3r3YVi

    The GPS receiver is located in that square area under the left index finger. I believe the beige & white chip with the red dot, labeled 'G273', is the GPS receiver, FYI.

  8. #7
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    I need to know where the antenna is, whether a separate item, exactly where located, etc......or, maybe it is a circuit trace on the PCB for the GPS....that is one way an antenna can be 'printed'.
    I guess I shall simply have to open the unit.
    thx

  9. #8
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    I believe the 'antenna' is integrated into that GPS receiver chip under the white cover. There's no 'printed' antenna...

  10. #9
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    I suspect you are correct! I may be premature in opening the case. I think I will use a sniffer receiver and probe the case exterior.
    Thanks!

  11. #10
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    Just puzzled, what are you sniffing and probing for? The 65LM is not a transmitter of any type... no Bluetooth. Certainly nothing that would affect your non-charging issue.

 

 
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