The headlights and dash lights dim intermittently. Tonight I monitored the battery voltage. When the lights are normal I have 14.2 volts and when they dim it goes as low as 11.8 volts.. It seems to happen more on rough roads and blipping the throttle slightly usually brings the voltage back up. The battery connections and grounds look good. The problem seems worse after a few minutes of highway driving.
I'm guessing the alternator is the problem but I haven't had this type of intermittent cutting in and out before and I haven't seen any warning lights on the dash display. Any suggestions?