GTM-20 has power but the traffic function does not work.When plugged in the light does not light only one green one for power and the traffic icon does not show on the gps c550 that I have can I repair the receiver myself? If so where can I get the parts?

Yes! The GTM-20 is a charger with a built-in traffic receiver. The charger plugs into the cradle for the Nuvi 660 and then the Nuvi 660 snaps into the cradle.

However to receive traffic with the GTM-20, you will need to purchase a subscription, either yearly or lifetime. The traffic receiver receives traffic information from FM radio broadcast stations, which broadcast traffic data.

The GTM-12 is an antenna including FM receiver - there's no fuse in there. It's powered by the Garmin navigator not from an auxiliary power source.

If the GTM-20 Traffic Receiver is functioning, you should see a blue diamond on the main screen and you should be able to find a traffic icon in the menu.

If the diamond is grayed out, then the traffic receiver hasnt locked yet. If the traffic symbol is completely missing, then yes it could be a problem with the traffic receiver or the cradle or plug that plugs into the cradle.

The Nuvi 6xx receives traffic information from the GTM-20 receiver through the plug that plugs into the cradle.


- Jim
SHARCNET-USA

The GTM 20 can be repaired. It's likely that either you're not using the correct fuse or there's a short circuit. The short circuit would be caused by the metal tip, spring or fuse touching the outer part of the plug. There's a repair kit available from http://www.gpscity.com/garmin-replacement-parts-for-gtm2x.html

Just so happens that my connector lost the red and purple wires, so the picture you have was a great help. Looking at the connector, the wire colors are red, purple, yellow, blue, black, green, brown.

firstly you will need to make sure that you have the latest software (run webupdater)
1) plug the traffic receiver into the GPS
2) plug the GPS into power
3) there will now be a new option available in your menu (traffic)
4) go to tools>settings>traffic
5) click on add subscription>next
6) there should now be a unit ID displayed on screen write it down
7) now plug your unit into your PC go to Http://www.garmap.co.za/traffic
8) click on the registration link, scroll down to the bottom of the page where you should find a link for activation
9) now you will need to enter your GPS serial number into the field followed by the Traffic receiver unit ID and the GTM serial number which should be found on the power cable of the GTM 25 and on the tag of the GTM 12.
10) you will then click next and be shown an activation/unlocking key, write that down and keep it safe.
11) now plug your GPS into a power source with the traffic receiver connected.
12) go to tools>settings>traffic click on add subscription>next and you should then be prompted to enter the unlocking key
do so and click done
13) your receiver is now unlocked and once you have got sattelite reception you should now have traffic reception


hopw

Check this out:
http://www.sharc.net/gps_charger_repair.htm

broken wire or bad fuse. it may "look" good but actually be bad

You have to have the traffic receiver / car charger in order for it to work (GTM-20) It looks like this:

https://buy.garmin.com/shop/shop.do?pID=403

It has a green LED for power and and an alternating yellow/red LED for traffic data detection.

Yes, you have to have a subscription to the service.


- Jim
SHARCNET-USA

I have the Nuvi 650 (for about a year now) and just bought the GTM-20 traffic receiver. This receiver came with the "free lifetime" traffic service. (Keep in mind that at first use, the receiver is "mated" to the Nuvi for "life". You can't move it to another GPS).

In any case, the GTM-20 manual says you only need to plug the two together and the two units will establish their connection automatically.

Mine didn't work.

I called Garmin and after a LOOONG hold time, finally got through to a tech rep. She advised that I connect my 650 to my PC and login to Garmin to check for upgrades. She was right. When Garmin offered this "free service for life", they had to issue a new software update so the Nuvi would accept it. She also advised I check the offered "optional" upgrades as well, and look for any that offered "traffic" in the title. There was one of those upgrades, also. (almost everything else was optional "voices" downloads).

I downloaded both the primary software update and the optional traffic update to the 650. It installed them automatically. She also advised "just to be sure" to do a hard reset on the 650. That involves turning the unit off. Then, while pressing a finger in the lower right corner of the screen, turn the unit back on. The unit will ask if you really want to risk losing personal data.. Say "yes", and the unit will do a clean reboot with the upgrades.

Reconnect the receiver and the 650. It may take awhile for the units to acquire the satellites, traffic signals, and set the internal key, but it did work. You may not see the "traffic icon" at the first map screen. If you go to the tools or setup screen, you should see the traffic icon at the lower right of the screen. Press that, and if you are in a coverage area, it will show traffic in the area.

If you have the first version of the GTM-20, you will have a set of LEDs on the power plug that show power and traffic signal info. If you have the new version of the GTM-20, there are no lights on the plug.

A couple of side notes. If you have a lot of "favorites" saved in your 650, you may lose those on the hard reset. To avoid that, put your 650 on the PC, go to your file explorer, and go to the "Nuvi" drive. Click on that, and find the the folder and file called "gpx". Copy that to a folder or desktop on your PC. After you do the nuvi reboot, reconnect the PC and copy the file back into the folder on the 650. That will restore your favorites.

Also, make sure you are in a covered area. If you are not, it won't find the signal and will not show you any traffic icon.

The first time after the upgrade and reboot, the Garmin rep said it could take anything from several minutes up to nearly an hour for it to establish the link (mine was about 10 minutes). After that, it will come right on.

A lot of information here, but the first thing is to get the latest software upgrade for the 650. I had upgraded mine about 4 months ago, and it was already two versions out of date. The newer version had the fix for traffic. I would start there.