1981 Corvette Engine Idle changes (Improves) when I unplug the two wire connector on thew alternator

by John
(San Clemente, California)

I have an 1981 Corvette with just under 31,000 original miles. I am not sure if the alternator is original or not and I have a brand new battery. Everything works great with two exceptions.
My dash, cabin running and under hood lights all pulse when at an idle but are consistent when the engine is above an idle. As I was testing connections while the car was running I unplugged the two wire connection to the Alternator and the engine idle actually improved (smoother idle) and gained about 150 rpms. The lights also stopped pulsing. What could have caused the idle to increase, run smoother and why are the lights pulsing at idle?
Also I have a slight flat spot when driving the car and starting from a stop. I assume carburetor rebuild but want to get ideas before I go there.

The entire car is stock, just as it was when driven off the car lot in California.

Thank you for any insights.

Click here to post comments

Join in and write your own page! It's easy to do. How? Simply click here to return to C3 Corvette Ask!.

Enjoy this page? Please pay it forward. Here's how...

Would you prefer to share this page with others by linking to it?

  1. Click on the HTML link code below.
  2. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable.
Chris Trautman @ Corvette Assembly Plant 2019

About Us: Corvette Web Central | Owner Bio: Chris Trautman

Established in 2008 by Chris Trautman, Corvette Web Central quickly grew into one of the top leading Corvette enthusiast websites globally. 

"This website is a passion of mine, just as much as being a Corvette owner," says Chris.  He was frustrated trying to find information on the internet about Corvettes which was was not biased or influenced somehow. 

He has owned three Corvettes over the last twenty years and does not plan to stop owning one anytime soon.

Note: Some links on this page are part of our affiliate program and provide a small portion of proceeds to fund the administrative costs and to fund more product reviews.  We are not paid to perform the reviews or are we given any products for free.  

You might like these