happy42316

2004 chevy tahoe z71 4x4, my dash and headlights are flickering i have a new alternator and batt is just now a year old what could be the problem

8.Lug

99 Black Bird T/A

iTrader: (4)

My 99 TA developed same issue. New alternator fixed flickering lights. Even the gauge cluster flickered. Probably a bad diode/ voltage regulator in my case.

j498

iTrader: (10)

I had this issue with an old Honda and the resolution was the same. I had a constant surging of power and increase in brightness from all lights that would increase then decrease every few seconds. Measuring my alternator output with a multi-meter showed it surging from 12v to 15V and back down again. Unplugging the alternator temporarily resolved the symptoms and confirmed that the unit was bad.

qweedqwag

Same thing here, replaced the alt and problem was gone.