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Hi... I have a JVC nt3hdt.. and I was having the same issue... all the wires was connected properly... but because I didn't have the GPS antenna hooked up it couldn't reach any sattelite to maintain de clock... once I received my GPS antenna, I plugged it in, the clock maintained itself pretty good!
Probably the gps antenna is not working due to rusty (water inside it). Check the antenna disassembling it. Third part antenna for the NT1 is not available due to proprietary connector so you must buy a (expensive) genuine new one from JVC. Sometimes it's possible repair the old one.
possibly a low or failing battery, You might want to also add an external antenna. Might i suggest the 50Db Skymaster from Marbella Australia, so change battery and check and invest in the antenna from marbella aust
n the system setup, under “UNITS” I set
BEARING to “MAG” (magnetic). This will cause the unit to display course /
bearing information in relation to the Magnetic North and match magnetic
compass readings. It is not the same as True North! One has to be careful with
this setting. There are a number of areas where the earth's magnetic field is
locally disturbed, sometimes very significantly. Your GPS may not account for
it.-again, under “UNITS” I set “METRIC”.
mine does the same thing....i even have the external add on antenna, mine turns on fine but as soon as you flip the antenna up on the back, the screen starts flashing and the system keeps rebooting over and over again...
the cheap way to fix it is to make an extended antenna
if you look in the back youll see a gold circle that is made to add an external antenna. now get some foil twist a small strand and push it in the back of the nuvi untill it hits the gold ring. just add some scotch tape to hold it and it should be good