Garmin Nuvi 760 satellites problem

If your new battery is arriving soon, I would wait for it to arrive, the Volts = 12.3 is not good news, this is the voltage of your car battery BUT it should not be this high on the display (unless your model of Nuvi displays different things), when my Nuvi is connected to the 12Volt car supply the Volts display never goes above 4.2, all the figures are the same as in #16. This is because the Nuvi charging circuity should be limiting the voltage, you might expect the display to show 12.3Volts when the Nuvi's internal battery is disconnected

 

I wouldn't connect your Nuvi to the car power supply for too long, because there is a chance that without a good battery in the Nuvi, that the 12.3Volts displayed on the 'Battery screen' could be damaging the Nuvi, Or it may be that your Nuvi does not measure the same things that my Nuvi does

 

I agree, any power supply, either Mains or Car battery, should be outputting 5V into the USB connector, my guess is that the fifth connector (the ID pin) on the Nuvi USB is feeding info to the Nuvi that allows it to know the supply is from 12Volts (even though there is only 5V present), I'm not sure where it would get 12.3Volts from though, it will be interesting to see what voltage is displayed with the new battery when the Nuvi is on the car supply, if it still says 12.3Volts, the unit is using the ID pin as detailed above, if it shows about 4Volts, my guess would be that the car supply is constant current rather than constant voltage, we will have to wait to find out

 

Ah, O.K. Sorry, When you said in your original post that unit was in the car when you bought it, I presumed you meant is was in the glove box or something, I didn't realise it was built-in to the car. So the centre connector feeds 12Volts directly into the Nuvi or the Mini USB connector feeds 5Volts into the Nuvi, Also the 'Volts' on your display does not say 'Battery Volts' as my Nuvi does, so that will be input Volts, it's all a lot clearer now. This does bring up another point though, when the unit is in the car, does anything connect to the gold round connector on the back, this is an external antenna input and will make the unit much more sensitive when finding satellites, there is also an antenna inside the unit, but I was wondering if, when it is in the car that it may not need to use the internal one.
BTW
With this new info., there is obviously no problem with operating the unit in the car when the display shows 'Volts = 12.3'

 

O.K., I still think the cradle, feeds 12Volts into the Nuvi and the Mini USB feeds 5Volts, which explains the two different 'Volts' display readings, If you was wondering why the 12V plug is so big when it takes 12Volts in and sends 12Volts out (i.e. not doing any Voltage conversion), the answer is it has a radio receiver in it, which feeds the Nuvi (via the cradle) with traffic information, so if you used the mini USB instead you won't get any traffic information. Some car windscreens won't allow the Nuvi to get a good signal (because they have metal heating elements in them), in this case you would need an external antenna

 

I glad to hear you have a working Sat-Nav. As you say they do need to store some info. to do a 'warm start', i.e. a start where they know where all the satellites are, their last position and time of day, without it they do a 'cold start' that can take hours. Units with removable batteries have a secondary built-in battery to hold this info. or it can be written to non-volatile ram (memory that needs no power) to ensure a 'warm start'. I have a 15 year old GPS that won't get a fix if left out doors for 12 Hours because both removable and internal batteries failed, the unit is argon sealed and can't be opened

Did battery replacement go smoothly?

 

O.K., great, if you have a problem with out of date maps, is is probably possible to install maps based on Open Street Maps for free

There is info. the link here :-
http://www.gps-forums.net/threads/road-tech-quest.46025/#post-225035

 

I am wondering if the battery is being charged at all, it obviously had some charge when it was delivered, but it won't last long, it really does need to be connected to a USB power source that powers AND CHARGES the unit, the secret battery page will tell you that the unit is charging and possibly the battery Voltage which should rise to about 4.2 Volts

 

When charging from your PC it will take quite a while to charge unless the Nuvi is in standby because the I-Limit = 500mA is not full power (full power is 1300mA), at 500mA most if not all power will be supplying the Sat-Nav rather than charging the battery. The Battery Capacity = 79% is obviously showing 21% from full charge, Battery Charging is good, but it may be doing it very slowly. You really need a mains driven charger that displayers I-Limit = 1300mA, any USB charger should be O.K., I use a Nikon charger supplied with a Digital Camera.

The other slightly worrying thing is that I would expect the Nuvi to turn off before the battery was 'flat' so that it always has enough charge left in standby to maintain the almanac, time, last position etc., I suppose with the car 'cradle' then the 12Volts would always be there, but you would have to leave the Nuvi in your car, which isn't very safe