Hier noch ein Zitat von talisman2 aus pocketgpsworld.com. Es hilft zwar nicht wirklich weiter zur Lösung der Probleme, aber lässt den Schluss zu, dass das Netzteil für gewisse Autos falsch designed ist...
ZitatI have been in possession of a Nuvi 310D/GTM12 combo for about 10 days now, and have tried it in both our cars, a Vauxhall Zafira (2001 'Y' reg) and Ford Mondeo (2005 '55' reg).
In the Zafira, the traffic alert reception is patchy to say the least. South of Weston-super-Mare on the M5 and the side 'A' roads is OK, but go towards London on the M4 and around the M25 reception was zero.
In the Mondeo, I have reception all the time, wherever I have been.