I made a parts run down to Oregon this weekend (3 hour drive each way). On the way back, about an hour into the drive, the charge light comes on. I stopped to check it out, all the wires on the alternator were tight. I kept driving, the CHG light went out. Then came back on at about the halfway mark. dash lights getting dimmer as time goes on. Turn signals stopped working, but headlights seemed OK if a bit dim. After about an hour the headlights shut off. It still had enough juice to crank the engine like nothing wrong, but the lights wouldn't come on.

I called my wife she brought the truck down and I swapped batteries. Made it home allright, only about 45 minutes later than expected.

Kind of shocked to have trouble with the 'ol trouble-free Datsun. Tomorrow I guess I need to replace the alternator brushes or something