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Old 07-05-2022, 03:41 AM   #1
sawun
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Default Lights Dim at High Revs

Anyone else here notice the lights dimming significantly when RPMs get over 6000?
Headlights, dash lights, everything.
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Old 07-05-2022, 07:34 AM   #2
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Default Re: Lights Dim at High Revs

Welcome to the forums. I've never been over 6000, there is no power up there.
...
Bryan Cotton
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Rebuilt at 204,067 September 2017
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Old 07-05-2022, 07:53 PM   #3
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Default 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.
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Old 07-05-2022, 10:42 PM   #4
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Default 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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