Lights Dim at High Revs

sawun · 07-05-2022, 03:41 AM

Anyone else here notice the lights dimming significantly when RPMs get over 6000?
Headlights, dash lights, everything.

Waiex191 · 07-05-2022, 07:34 AM

Welcome to the forums. I've never been over 6000, there is no power up there.

fetchitfido · 07-05-2022, 07:53 PM

I'd say it's alternator related but due to a worn out serpentine belt slipping on it rather than an actual alternator issue. If it's a neoprene belt it'll look brand new by 80's/90's belt standards despite it being very much worn out.

billr · 07-05-2022, 10:42 PM

Sawun, is this just a curiosity question, or do your want to find out what is going on? If you want to track it down, start by connecting a voltmeter to the system and tell us the actual voltage change when the dimming occurs.

07-05-2022, 03:41 AM	#1
sawun New Member Join Date: Jul 2022 Posts: 1	Lights Dim at High Revs Anyone else here notice the lights dimming significantly when RPMs get over 6000? Headlights, dash lights, everything.

07-05-2022, 07:34 AM	#2
Waiex191 Master Member Join Date: Oct 2016 Location: Poplar Grove, IL Posts: 3,526 1999 SL2 1998 SC2	Re: Lights Dim at High Revs Welcome to the forums. I've never been over 6000, there is no power up there. ... Bryan Cotton '99 SL2, 5SP bought new Rebuilt at 204,067 September 2017 Engine, subframe, diff pin mod, brake lines, headliner, alternator, and so on! '98 SC2, 5SP bought 2018

07-05-2022, 07:53 PM	#3
fetchitfido Super Member Join Date: May 2006 Posts: 15,152 fetchitfido's Photos 2001 SC2	Re: Lights Dim at High Revs I'd say it's alternator related but due to a worn out serpentine belt slipping on it rather than an actual alternator issue. If it's a neoprene belt it'll look brand new by 80's/90's belt standards despite it being very much worn out.

07-05-2022, 10:42 PM	#4
billr Master Member Join Date: Jul 2013 Posts: 6,616	Re: Lights Dim at High Revs Sawun, is this just a curiosity question, or do your want to find out what is going on? If you want to track it down, start by connecting a voltmeter to the system and tell us the actual voltage change when the dimming occurs.

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