Anyone have a wiring diagram online? My battery keeps dying and I know I need to fix the wiring. That or *gasp* sell the nissan... so former works better than the latter

take your alternator out and have it tested at a auto parts store, or if you have a multimeter you should be able to test it at home. charge battery and test voltage, then start car and voltage should be higher than it was when car not running, probably around 13.5-15 volts. if it seems ok, maybe the battery is old and has been discharged/charegd too much and wont hold a charge anymore