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Username Post: Headlights Flickering/ pulsating at Idle        (Topic#344965)
Forum Newbie
Posts: 1

Reg: 05-24-17
05-24-17 06:23 PM - Post#2692759    

05-24-17 06:19 PM - Post#359945

Just joined the site as I am in desperate need of help. I have a 2006 Silverado 1500 5.3 V8. Long story short, the truck ran fine for weeks/months then would randomly drain overnight and have no power the next morning. Jumped it, then would run another few weeks and drain on me again and again. Battery was replaced month ago with Duralast Gold and didn't help. Replaced alternator as there was supposedly a short that was causing parasitic drain but battery fully drained overnight once again about 2 weeks later... brought back to mechanic and the entire system was tested and electrical system showed no parasitic draws, bad grounds, etc. Now all the sudden I have pulsating/flickering headlights only when truck is idling at a stoplight and returns to normal as I drive and RPMs increase. So far no more battery drains as I have been turning off radio/AC before shutting my truck off. Any ideas at all on this flickering issue? Also to add I have been hearing a weird hissing blowing sound from the middle AC vent on the dash.
Preciate any help in advance!


Honored Member
Posts: 27555
Loc: San Francisco, CA
Reg: 11-26-02
05-25-17 09:40 PM - Post#2692953    
    In response to rcarter_

If neither the flickering nor hissing is affecting how the truck runs/drives now, I would recommend leaving them both alone until something more disabling occurs. Then the problem will be easier to diagnose. And yes, I realize this isn't the answer you were hoping to hear.


Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.

Very Senior Member
Posts: 4015

Reg: 12-29-02
05-26-17 07:12 AM - Post#2692996    
    In response to rcarter_

To randomly drain the battery overnight and then work again for weeks means that whatever is draining the battery isn't constantly present. I would guess it's an accessory like a power seat switch failing/sticking which keeps the lumbar or seat motor on. Try pulling the fuses for anything you don't normally need and wait to see if it happens again.

The headlights flickering or pulsing at idle could be indicating that the same load is turning on and off while driving and is large enough to cause a headlight flicker at idle.

x inFEKTid x 
Posts: 364
x inFEKTid x
Loc: east side of atl
Reg: 04-14-08
06-11-17 05:00 PM - Post#2695524    
    In response to rcarter_

It's your alternator. Replace it. The field is breaking down inside the stator and will leave you stranded. That's why it's not charging right . If you drive there's enough voltage to "somewhat "charge the batt. But yeah. It's the alternator.


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