Lights Pulsating

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11-03-2008, 01:30 PM

kln5014

1st Gear Member

Thread Starter

Join Date: Oct 2008

Location: Canada

Posts: 129

Lights Pulsating

Hey guys, I have a 00 GT with 69k miles and it. I'm having an electrical issue where all my cluster lights and exterior lights keep pulsating. I took out my alt and had the alt and regulator check and they both are fine. The serp belt has plently of tension on it too. I cleaned the battery terminals up to be spotless and it didn't seem to change anything. The volt meter is constantly up about 3/4 of the way up to the H.

any suggestions? thanks!!

11-03-2008, 01:41 PM

Derf00

Gentleman's Relish

Join Date: Feb 2005

Location: AZ

Posts: 13,090

Diode trio could be going out on the alternator. A bench test wouldn't necesarily catch a failing alternator that's intermitent.

Does it only do it when the head lights are on? (Turn on just the interior lights to check)
Does it only do it on high RPMS or idle?
AC on or off?

11-03-2008, 01:53 PM

Tim99GT

4th Gear Member

Join Date: Dec 2007

Location: Lafayette, LA

Posts: 1,700

Could be the contact in the switch itself that is going out. Does it happen on smooth roads or does it only happen on rough bumpy roads?

11-03-2008, 02:28 PM

defconfire

5th Gear Member

Join Date: Mar 2007

Location: Cary/Charlotte, NC

Posts: 3,791

This Happened to me at Idle. I took my alternator to autozone to have it tested, and it checked out ok. So being stubborn I replaced it anyways and it worked fine after that.

11-03-2008, 02:47 PM

kln5014

1st Gear Member

Thread Starter

Join Date: Oct 2008

Location: Canada

Posts: 129

It does it at all rpms including idle, and the pulsating seems to be at the same pace no matter what rpms or gear its in. Happens with lights on and off...ac doesn't have an effect on it either.

The volt meter on the dash moves up slightly when I turn on the headlights.

Thanks for all of your input guys, I hope I can get away without replacing the alt, the owner before me replaced it just recently (don't have the receipt) and after calling around the best price I found was 215

11-03-2008, 04:19 PM

lizzyfan

Underboss

Join Date: Jan 2006

Location: Helaware

Posts: 20,273

Really sounds like an alt. issue to me

11-03-2008, 05:54 PM

1fast5OH

2nd Gear Member

Join Date: Aug 2007

Location: GA

Posts: 183

i had the exact same problem with my car, i checked the alt. just like you and just about everything else imagineable. i eventually took it to a place that just deals with electrical systems in cars, and it turned out to be a floating ground. but yeah my headlight and all the lights inside the car would flicker.........very annoying!