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gpgofast · 07-27-2020, 08:43 AM

I have a similar alternator on my 1971 K20. It has a TPI motor out of 1986 Corvette, but the alternator is off of a 1990s Chevy Pickup. Running a serpentine belt. I have a 16 inch SPAL electric fan. My idle is computer controlled right at 750 RPM and I don't see any issues when the fan kicks on other than sometimes the AMP gauge needle dips on fan startup. 550 RPM is a really slow idle speed.

Have you tried just bumping the idle up?

07-27-2020, 08:43 AM	#5
gpgofast Registered User Join Date: Jan 2016 Location: Washoe Valley, NV Posts: 110	Re: Alternator question I have a similar alternator on my 1971 K20. It has a TPI motor out of 1986 Corvette, but the alternator is off of a 1990s Chevy Pickup. Running a serpentine belt. I have a 16 inch SPAL electric fan. My idle is computer controlled right at 750 RPM and I don't see any issues when the fan kicks on other than sometimes the AMP gauge needle dips on fan startup. 550 RPM is a really slow idle speed. Have you tried just bumping the idle up?