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Old 11-01-2005, 09:08 PM
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Flickering headlights

I have a 98 Chevy pickup, 350, and have a problem with all the lights in the dash and headlights flickering quickly when driving. I notice it at night, but assume it is happening all the time. It has a relatively new alternator from napa and have put a meter on it to see if you can see the meter pulsing also. You can't see the meter pulse but I suspect it is because the pulse is so quick, I would estimate around 5 to 10 pulses a second. Any thoughts about what the culprite might be????
Thanks in advanse
Dan

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Old 11-01-2005, 09:54 PM
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well....i would start with the alt....easy enought to remove...and have it tested....that would have a internal voltage regulator....
i would think thats where....well lets hope thats the problem....
other wise....chasing electrical problems suck.......your pal mark....
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Old 11-01-2005, 09:55 PM
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o and WELCOME MY BROTHER......great to have you here....enjoy the board...
your pal mark...aka the RAGENRAT638
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Old 11-02-2005, 03:31 AM
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Doc here,

Welcome To The Forum!

Can you (if you listen real carefully) hear a clicking or whine in the alternator?

It could be a Brush is not seat properly or cracked when installed..

Most likely though it's a Diode in the regulator switching when it shouldn't be..

In either case the fault seems to lay with the new alternator...They Have high Fail rates new out of the box..so don't be surprised if it is defective..

Take it to Auto zombie or the parts superstore..and have it tested..OR just pull it and take it back and get another..(have them test the brand new one before you leave the store!)

BTW : what was the output reading on your DVOM? should have been 14.4...

Doc
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Last edited by docvette; 11-02-2005 at 03:32 AM. Reason: bumbling bigthumbitis
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Old 11-02-2005, 10:36 AM
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wate untill night and then start it look at all of the sparkplug wires if they are grounding before the plug they may be causing the mysterious flasing lights
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Old 11-08-2005, 07:10 AM
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Thanks for the imput

Thanks for the imput. It was the alternator. New one is in and all is fine
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Old 11-16-2005, 06:04 PM
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I have the same problem

I just replaced my alternator and battery but I still have that headlight and dash issue, could it be my voltage regulator?
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Old 11-16-2005, 10:36 PM
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Quote:
Originally Posted by eedjay
I just replaced my alternator and battery but I still have that headlight and dash issue, could it be my voltage regulator?
Doc here,

The Next big offender is grounding issues..

Set up your ground system this way:

Run a properly gauged Ground cable from the battery to any handy bolt at or near the starter, From that same bolt get a Battery cable at the parts store, that has two 3/8 ring terminals on each end and attach it there and to the Frame.

Next get some 10 gauge wire and ring terminals and run that from your bolt on the block to the Firewall, and another to the Alternator bracket or mount bolt.

If the Bracket and alternator is power white remove them both and their hardware, sand or pressure wash them until clean semi shiny metal, dry and reinstall.

You have electrolysis there..and it will also eat a water pump impeller up faster than any acid..The Alternator Bracket and Alternator housing is Aluminum and the block is Steel..(what were they thinking?)

When you go to reinstall the brackets, go to the hardware store and get some aluminum wire compound, and coat everywhere the mount hardware meets steel (bolts, mount surfaces Ect..)

Next get some Wire Braid, (Radio Shack) and install braid from the radiator support to the frame, Fenderwells to frame , hood to firewall, Doors to door posts, gas flap to body, tailgate / Trunk to body.

At each point the wire is grounded, Burnish ALL the paint and grease off to bare metal. Use a proper star-washer and lock. Use sheetmetal or Tech screws where no screws are available.

It sounds like a lot of work, but after you assemble all the parts, it's only a few hours to do..and you'll end up with a system that will work reliably for many years to come..and can eliminate that from your troubleshooting list.

Doc
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Old 11-17-2005, 04:12 AM
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The first thing that comes to mind is a bad or loose ground. Check all of your grounds. Also a bad dimmer switch can cause this.
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