I have a 90 Loyale 1.8L non turbo 4wd with a 5spd. It started with not responding to throttle with the headlights on and now it progressed to constantly. First thought was the voltage regulator in the alternator going out since the problem was under load. Replaced the alternator. No change. Ran a voltage test with the old and new alternator and get roughly 11 volts at the battery not running, then running with a jumpstart, and steady decline. My thoughts are running on battery alone. Also checked voltage output at the alternator and the fusible links which all stay steady with battery voltage running. Changed the battery and got it home, but still only show 12.2 volts running. I should be atleast over 13V,and it normally charges around 14.3V. Best I can tell, all grounds are good and in the proper locations. Ran fine up until about 2 weeks ago after changing rear axle out. Any ideas?