C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

new one on me

Thread Tools
 
Search this Thread
 
Old Jun 28, 2014 | 11:36 PM
  #1  
namvet6869's Avatar
namvet6869
Thread Starter
Racer
Supporting Member
15 Year Member
Veteran: Air Force
Liked
Loved
 
Joined: Oct 2007
Posts: 431
Likes: 22
From: Chester Illinois
Default new one on me

Am an old timer have been around a few years. Driving my 81 around today and suddenly my radio shut off and antenna retracted. Then in a few seconds radio came back on and antenna extended. Kept doing this and I thought wtf. Started looking at my gauges and they would shut down when radio shut off and the voltmeter needle would go in the red at 18 volts. This all happened at a slow speed. Kicked it up to highway speed to get home and everything leveled out. When home I tightened battery side terminals of which I thought were tight enough. I got about a quarter turn more on them. I put a new alternator on the car a month ago. It was just like I unhooked the battery but the car ran fine. I have not taken it for a test drive yet. Just wondering if everyone thinks I am on the right track with the terminals or maybe a dead short somewhere of which I have no idea where to start.
Reply
Old Jun 29, 2014 | 05:11 AM
  #2  
doorgunner's Avatar
doorgunner
2026 Loser of the Year
Supporting Member
10 Year Member
Veteran: Army
Photogenic
Photoriffic
 
Joined: Sep 2013
Posts: 36,597
Likes: 7,046
From: New Or-leens Loo-z-anna
Default

Wiggle under-dash wiring with the engine running to see if you can cause the problem to "act up" and narrow down the problem area....

do the same to the wiring under the hood while someone watches the gauges for you ( or turn up the volume on the radio to see if it "cuts out")...

Check under-dash ground wire connections....also check under-hood ground connections.

That battery negative cable can be hiding the problem by being corroded internally under the insulation on either end or corroded at the frame ground....same with the positive cable (been there!)
Reply
Old Jun 29, 2014 | 08:45 AM
  #3  
4SPDL81's Avatar
4SPDL81
Racer
15 Year Member
Liked
Loved
 
Joined: Aug 2010
Posts: 337
Likes: 6
St. Jude Donor '16
Default

New alternator maybe going bad?...over volt indication could be an intermittant/defective voltage regulator....(internal to the alt. on an '81)...Good Luck!
Reply
Old Jun 29, 2014 | 07:46 PM
  #4  
namvet6869's Avatar
namvet6869
Thread Starter
Racer
Supporting Member
15 Year Member
Veteran: Air Force
Liked
Loved
 
Joined: Oct 2007
Posts: 431
Likes: 22
From: Chester Illinois
Default

If the alternator is overcharging at times, why would the radio shut down? Could that be a safety feature of the radio. Radio is a Kenwood.
Reply

Get notified of new replies

To new one on me





All times are GMT -4. The time now is 06:10 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE