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Registered
Join Date: May 2008
Posts: 8
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Alt light flashes, idle speed increases
While idling, my 1968 911L will suddenly flash the altenator light on for half a second and then immediately the idle speed increases 200-300 RPM for a few minutes and then settles back down to the previous RPM. What could possibly cause this?
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09-25-2010, 05:10 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,449
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when the alternator is charging, it creates a small load on the engine. it's not charging when the light is on, so the engine doesn't have that load and speeds up a bit. check your brushes.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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09-25-2010, 05:17 PM
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Join Date: May 2008
Posts: 8
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Thanks for your input, John; what you say makes sense. What I'm confused about is,
why does the higher RPM persist for several minutes, after the "not charging" light had only flashed on for a split second? I'm going to pull out the alternator, follow your advice and check the brushes. I'll send you some feedback on the problem as I progress, hopefully to its resolution! |
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09-26-2010, 06:03 AM
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