I was totally thinking there'd be no way the N76 would have 7 bands, and it's for sure now:
WCDMA 2100
EGSM 850/900/1800/1900 MHz
source: http://europe.nokia.com/phones/n76
Hope that N75 shows up quick...
I have a '93.........the 4 wheel drive will have nothing to do with it.......check to see if you got a bad alternator....most of them are rebuilt and I've got "new" ones in the past that did not work right. otherwise it has to be the battery or the voltage regulator.