This has been something I've always noticed but always thought of it as a normal thing... but, when I'm at idle, the lights are dimmer than when I'm acclerating. The flickering is very fast, where the lights flicker probably 5 to 10 times per second. The headlight flickering or dimming may be caused by a intermittent low voltage output from engine vibrations. When this occurs, a voltage spike causes the voltage regulator to reset. If you are coasting and the idle is around 1000 RPM the flickering goes away and the voltage stabilizes. Interior lights and headlights still seem to pulse/flicker while idling the most, when accelerating, it seems the problem goes away until idling again? During the reset, generator output drops to almost zero. The overhead dome light is also affected. If your lights are bright, then dull, then bright again (either on a regular beat or seemingly at random) then you definitely have a problem with your electrical system, and the alternator is the most likely culprit. The dash lights, gauges, heater and airconditioner all quit at once. It appears to get worse when you increase the RPM. My Headlights and Interior lights were flickering as I was driving in this morning. i have a 94 safari van - when headlights are on, they flicker ( bright and dim) - all lights in vehicle are affected and if i turn on the heater fan the lights go dim - … … Continue reading "2005 GMC Sierra, Lights Flicker or Pulsate" 20 Posts . I drive a 2005 Trailblazer. 2.0 diesel - Lights flickering & car accelerating by its. These two symptoms often go hand in hand, but not always. I have noticed recently, that I can get a fairly consistent flicker from the headlights (about 70% of the time). o_O For example, if I'm at a red light and sitting in neutral, and I rev the engine, the headlights as well as the dash lights, will go brighter. Discussion Starter • #1 • Jan 11, 2009. Oct 11, 2008 Thread starter Ravan; Start date Oct 11, 2008; R. Ravan New member. If you experience flickering headlights, stalling or strange noises when driving, your car isn't haunted; chances are it's just a failing alternator.The alternator is a key component in your car's electrical system, turning the energy from the crankshaft into useful electricity to power your vehicle's electrical systems and to help the battery recharge. Dash lights do not pulsate. The voltage fluctuation varies quickly from about 14.2 to 14.5 volts. Joined Jul 8, 2007 Messages 4 Reaction score 0 Points 0 Location Sutton Coldfield, West Midlands. This is a known issue with GM cars and the correction involves replacing the alternator. If your lights aren't actually dim, they might be flickering instead. :hmm: ... 93 eldo lights flickering ... this sucks My 88 did this before the light finally quit working for good. This is a common complaint on many Cadillac, Chevrolet and GMC full sized trucks and suv’s. As the system runs the problem diminishes but never goes fully away. Then as the revs drop back down to idle, the headlights and dash lights dim again. This all started happening after I had an alternator and battery go … If I have been driving for a while (about 10 minutes or so), and idle for a moment (such as at traffic lights), the lights will usually flicker just after accelerating from idle (with medium-high rpm). This 2005 GMC Sierra came in with the complaint that when the vehicle is started cold, the headlights, dash lights and dome light will flicker or pulsate. 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