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Headlights pulse while driving - 2007 GMC Yukon Denali

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The headlights pulse while the engine is running


Pulse? you mean the elevation mechanism is oscillating? or the lights go dim and then bright like you were constantly on the dimming switch? if this, there is a dimming switch/relay that operates from a single pulse from your driver's dimming switch. I am guessing you have a cross over from power supply and engine vibration does the pulse. Follow the headlight wire back from to a little box, probably metal. Check all connections and possible crossover. It could be within the switch and going haywire. You may be able to listen to the continuous clicking. You may be able to rebuild it, but may not be worth it. So buy a new one. If it's the elevation mechanism, there may be a similar relay for the motor but connected to the lights on switch. There may be a faulty relay, or again viabrating donnection with a make break operation.

Mar 15, 2015 | 1976 Chevrolet Corvette

2 Answers

Headlights pulse


This sounds like a potentially failing alternator, I've had this happen a few times. When idling in drive, the alternator is spinning slower, so it produces less power. You can be more sure of this being the issue if the lights brighten when you shift into Neutral, where much less load is slowing the alternator. With a failing alternator, it can produce enough power when the vehicle is moving and hence running at higher engine RPMs, but when it drops below a certain threshold, the alternator is just not moving fast enough to produce enough amperage to run all the vehicle's electrical systems. If you can remove the alternator yourself, you can get it tested for free at many auto parts stores (call first if you're not sure). Otherwise, getting it tested at a reputable garage should be relative inexpensive.

Apr 09, 2014 | 2002 Ford Explorer

1 Answer

2008 Town&Country Chrysler minivan makes a loud whirring noise coming from under the hood. It seems the worst in cold weather, and at start-up. But doesn't go away when driving. Causes a rhythmic...


Power steering reservour may have plugged screen. Fluid flows better when warmer weather thus, no noise of starving power steering. Have a look at this link. http://www.youtube.com/watch?v=_QjBLYltLYY

Feb 12, 2014 | 2006 Chrysler Town & Country

1 Answer

My headlights, dash lights, and interior lights started to pulse the other day. I had the battery replaced and the alternator checked (twice) and it passed both times. The ground wire is connected fin


Hmm...odd. You've had the alternator checked, but did you inspect the belt? Might be slipping under load. Check your owners manual to see if all of the affected circuits share a common fuse. If so, replace the fuse and clean the connections in the fuse slot as best as you can. The last thing would be to take it to a dealer, have them hook up to their diagnostics machine and see if a code pops up. If its a random pulse it might be a loose connection somewhere (harness connectors, etc.) if its a steady pulse it has to be in the charging circuit or in the ignition circuit.
Oh, one last thing to check: most modern cars have an drain loop to protect the ECM from electromagnetic induced "noise". It should be a wire in your harness (probably not insulated) that makes a loop around the engine compartment. It should be grounded at both ends, probably at the same place on the case of your ECM. You can do a search on the internet to verify that your car has one, where it is and what it looks like. If it does, and you find it, check to make sure it has a good connection to ground, and that the loop is still intact.
Good luck.

Jan 20, 2014 | Subaru Cars & Trucks

1 Answer

My car lights pulse


check the ground wire connection at the raid support and the ground cable from the battery to the body

Jun 20, 2012 | 2003 Ford Focus

1 Answer

1998 Dodge Neon. At low speed or idling, the headlights pulse. They seem to pulse in time to the idling of the engine.


You need to check the amperage output of your alternator. Sounds like it is either too low of rpm`s from your engine or your alternator/regulator is going bad.

May 05, 2011 | Dodge Neon Cars & Trucks

1 Answer

Why do my daytime running lights (head lamps) pulsate when motor is running. 2002 mazda tribute


Are the pulsing during driving or just at stops and idle? The pulse 99% of the time indicates a loose generator belt or bad alternator. YOu can have the alternator checked at a local parts store such as AUtozone, Advance, Napa, or Oreilly's free of charge. Depending on the age of your belt it may be time to change it as well. P.S. you notice your headlights because thats where your eyes are focused.. but turn your instrument light control knob all the way to brightest and willing to bet they are pulsing slightly too..

Aug 14, 2010 | 2002 Mazda Tribute

2 Answers

Turn signal shorting out


check to see if u have voltage pulse 12v at the socket with a test light . ir not you shoud repair wiring between flashr unit to signal socket. good luck

Feb 01, 2009 | 1999 Audi A6

1 Answer

98 Camaro Headlights wont work


Dash lights were falsing ? I assume you mean pulsing .
driving lights come on ? daytime running lights or park lamps ,does the vehicle have daytime running lamps . Daytime running lamps module .
Daytime Running Lamps (DRL) Module (Headlamp Auto Control Module)
Mounted behind the radio and the HVAC control, left of the instrument panel compartment.

Jun 17, 2017 | 1998 Chevrolet Camaro

1 Answer

Battery discharging/lights pulsing


i would say that the regulateur on the altentor under pressure can not supply the charge. it might test good but it's not just have a shop replace your alternateur and that should solve your problem.hope this works for you .

Jan 05, 2009 | 1999 Lexus RX 300

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