Hi,
I mounted my Garmin on my F800GT, and powered it via a 12v to USB adapter. At the adpater end I used a USB cable to plug into the GPS. All worked fine, except traffic reception.
I wasn't using the TA-10 12v adapter from Garmin, and the GPS wouldn't enable traffic reception. For me the TA-10 took up too much room on the bike, which is why I went with the 12v USB adapter you can get on ebay that are much smaller.
After doing a bit of searching, it seemed a resitor, 17K4 was in play on pin 4 of the USB end. But some people wrote it was connected to pin 5. I had a partially broken Garmin TA-10, so I took that apart to check the pin out. I discovered on my adapter that this was not connected to pin 5, but the metal case.
My goal was to be able to use a custom USB cable with my Garmin GPS, and have traffic info.
Pin 1 5v
Pin 2 Connected to 3
Pin 3 Connected to 2
Pin 4 17K4 to outer case
Pin 5 Ground
Middle wire = 5v
Sheath wire = Ground
After making these measurements, I built myself a custom cable, with pins 2 and 3 shorted together, and pin 4 connected to the outer case with a 17K4 resistor. Pins 1 and 5 for power. What is important is, that it seems the wires for pin 5 or pin 1 are used as the antenna. You must make the cable using unshielded cable. If the cable is shielded, then the signal is too weak. My first cable was built with shielded cable.
I tested this on my Garmin Drive 40, and it works great. I also had a Garmin 240 LMT, which is pretty much the same 4.3 inch size case, and that worked fine too. Those Garmin units are so cheap when buying used, I spent more money buying the parts to make the cable that the GPS itself !!! But the GPS is great. Its not waterproof, but I hardly ride in the rain anyway, and my mounting is inside the fairing, so it has some protection anyway.
I mounted my Garmin on my F800GT, and powered it via a 12v to USB adapter. At the adpater end I used a USB cable to plug into the GPS. All worked fine, except traffic reception.
I wasn't using the TA-10 12v adapter from Garmin, and the GPS wouldn't enable traffic reception. For me the TA-10 took up too much room on the bike, which is why I went with the 12v USB adapter you can get on ebay that are much smaller.
After doing a bit of searching, it seemed a resitor, 17K4 was in play on pin 4 of the USB end. But some people wrote it was connected to pin 5. I had a partially broken Garmin TA-10, so I took that apart to check the pin out. I discovered on my adapter that this was not connected to pin 5, but the metal case.
My goal was to be able to use a custom USB cable with my Garmin GPS, and have traffic info.
Pin 1 5v
Pin 2 Connected to 3
Pin 3 Connected to 2
Pin 4 17K4 to outer case
Pin 5 Ground
Middle wire = 5v
Sheath wire = Ground
After making these measurements, I built myself a custom cable, with pins 2 and 3 shorted together, and pin 4 connected to the outer case with a 17K4 resistor. Pins 1 and 5 for power. What is important is, that it seems the wires for pin 5 or pin 1 are used as the antenna. You must make the cable using unshielded cable. If the cable is shielded, then the signal is too weak. My first cable was built with shielded cable.
I tested this on my Garmin Drive 40, and it works great. I also had a Garmin 240 LMT, which is pretty much the same 4.3 inch size case, and that worked fine too. Those Garmin units are so cheap when buying used, I spent more money buying the parts to make the cable that the GPS itself !!! But the GPS is great. Its not waterproof, but I hardly ride in the rain anyway, and my mounting is inside the fairing, so it has some protection anyway.