20 thoughts on “Alternator Problems – Head Lights flickering – Chevy Silverado 2004 1500 4.8L V8

  • same issue with 02 safari changed alternator and what do you know lights have a mind of there own.I m gonna try what you did thanks

  • I've read in forums that the voltage regulator in the oem alternators are crap. get a good aftermarket replacement regulator and swap with the old regulator. buying a new oem alternator just gives you the same problem. YouTube has a couple videos on it. 1.5 hrs of time and about $20, and that's if you buy new brushes too. good luck

  • Hoestly lol i just tightened up my mounting bolts another half turn and it fixed the same problem. Thanks for the video dude! Nice truck!

  • The truck is a 2004 Silverado 1500 4.8L V8. I know i call it a 4.3 in the video. Don't tell me its a V6, You'll just embarrass yourself.

  • I had the same problem with my 2011. Not as extreme as yours but my lights were flickering and pulsating under acceleration. Finally figured out it was a bad negative terminal at the battery. Looked fine, but there was a voltage drop from the battery post to the 2 cables, literally 2 inches away. Cut the cables, put a new terminal end on. No more voltage fluctuation or flickering lights. I also added a ground strap from the engine to the firewall and wasted money on a new alternator that didn’t help. You must use a multimeter and check all the grounds while it’s running. Put it on voltage mode, and probe each end of the ground wires. It should read 0 volts. Like .1 or .2 max. Mine read 1.5 volts. Not good. Hope this helps somebody. What a pain.

  • Either loose belt or loose connections and unhooking the unit and hooking it back up either fully connected the wires or moved the short where its not happening anymore. I drive a 2008 lincoln mkz and just replaced the alternator yesterday and im now having this same problem. Lights flickering but everything still works fine. Wake up this morning and statt the car and no flickering. I think ive got a short somewhere thats moving around from the vibrations of the car or loose ground connection. It didnt do any flickering before i got a new alternator only after. And on a lincoln i had to take half the damn car apart to get the alternator out so possible i disconnected a grpund wire and didnt notice?

  • Thank You. Same problem even paid techs can’t find problem so I’m searching for answers and sad part my vehicle still under warranty

  • My 05 Chevy Silverado does exactly the same thing. I thought it was in the dimmer switch but maybe it’s the alternator

  • Thanks man my 1999 Ford Expedition 5.4L was doing da same thing just replaced with a new alternator and problem solved 👌🏼👍🏼💯

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