Lights pulse or flicker when accelerating - Chevy Impala Forums
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post #1 of (permalink) Old 03-21-2019 Thread Starter
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Lightbulb Lights pulse or flicker when accelerating

2016 Impala Limited LT 3.6 V6 70k miles
When I'm accelerating, my headlights (and I assume taillights as well) pulsate. The overhead dome light is also affected. Dash lights do not pulsate. This all started happening after I had an alternator and battery go out on me, leaving me with a dead car. Warranty covered a replacement of both. Since then I notice the problem when I merge onto highways or press the gas more than 10%. In park, if I rev the engine to around 1.5k or 2k rpm, I notice the interior dome light doing the same thing. When the car is idling, there is no pulsing that is enough to cause concern.

I have a dash camera running through my OBD port with an adapter. I had it installed after my window was broken. I had a car audio shop install a 10" powered Sub/Amp. The camera was on my car since before my alternator and battery went out, the audio equipment was installed after new alternator and battery.

I turned off all accessories, pulled the fuse on my amp, unplugged my camera, and still I notice a pulsing when I rev over 1500 rpm. I noticed I could force the lights to stop pulsing if I act like I/m rolling my windows up.

I work at a GM dealership, and I've asked around my shop, and none of the technicians have any other ideas.

Am I putting too much load on my alternator? Do I need a bigger battery than stock?

Last edited by headrocker07; 03-21-2019 at 07:25 AM. Reason: add more info to title
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post #2 of (permalink) Old 03-21-2019
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Almost sounds like vibrations causing the issue - as in when the motors revs enough, it increases vibrations and is maybe causing a loose connection to become "intermittent"...

Just something to consider... Usually, flickering lights occur more at idle than at higher RPMs (when dealing with lack of power) - as more RPMs allow the alternator to generate more power.
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post #3 of (permalink) Old 03-23-2019 Thread Starter
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It could be but remember, i can fool the car somehow by using my window switches while the pulsing happens. It goes away until i stop using a window switch.
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