Thread: Intermittent traffic with nuvi 2580TV

I don't think the SAm 2580TV was ever bundled with a traffic receiver, but it says in the specifications that it's traffic compatible although there's no GTMxx listed under 'Accessories':

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However the Quick Start Guide has this to say:



The FM traffic of GTM25/26 should work ok if the 2590TV can indeed use traffic. However those chargers only have output of 5 Volts 1 Amp and most modern Garmins [post-2010 models] need more current to both charge and run the unit at the same time. The later units GTM25/36 have 2 A output.

Originally Posted by fminguser

Thanks for the reply NEIL , however, was doubts and are simple: I want to know what the differences between a cable that is GTM25 and GTM 36, because this device my really works TMC

The big difference is in the power available as i said before. Newer devices are backwardly compatible with the FM TMC part of the GTM2x and GTM3x is otherwise basically the same.

however, with the GTM 25 it recognizes the traffic when off and connects again, disappeared all over again. What is the reason to do this ?

Maybe it's a problem with the traffic signal not being reliably received. Try connecting an external antenna to the FM module.

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More trouble shooting here:

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Just to clarify what i meant in case you misunderstood this:

The big difference is in the power available as i said before. Newer devices are backwardly compatible with the FM TMC part of the GTM2x and GTM3x is otherwise basically the same.

By that i'm saying there would not a compatibility problem at all, as the traffic workings of all GTM25/26/35/36 are basically the same when used in newer units [it the reciprical which is a problem, some older devices cannot use GTM35/36, only GTM25/26. You may still find that a GTM25/26 will have a problem maintaining the charge in your modern unit while navigating however and it's feasible that the unit will at times draw more from the battery than the charger is capable of delivering [in excess of 1 Amp]. Not a big problem if you have the battery fully charged before you start navigating anyway. GTM25 have a known problem where the FM module fails although normally it will fail totally rather than intermittently like yours did. That stated potential under-power is confined to the device, it's unrelated to power to the FM module of the traffic receiver, because it receives its power before the device does.

As this is not about enabling free traffic subscriptions, i'll move these posts from [Only registered and activated users can see links. ] to it's own Discussion thread. Glad you're sorted mate.

I'm not an electronics technician however i can say that the device will only draw what it needs from the power source so if it needs 1.5A to function and the source is capable of delivering more, say 5A, there is no problem. But if it needs 1.5A and the source can only deliver 1A then there is a problem. So if you're asking will there be a problem with the nuvi if you can boost the GTM25's current output to 2A, then absolutely no there won't be provided that also voltage is maintained at ~5V only.