Source: Chevrolet Technical Service Bulletin
Subject: Audible Noise in Radio - Chevrolet with Transistorized Ignition
Model and Year: All Chevrolets
Bulletin Number: TSB #66-83
Date: August 8, 1966
TO: ALL CHEVROLET SERVICE PERSONNEL
Engine noise may be audible in the radio of some Chevrolets equipped with factory installed transistor ignition. The noise is caused by the additional ignition primary feed wire required by the transistor ignition system. This wire runs from the ignition switch up and through the firewall, and attaches to a white resistance wire connecting to the transistor amplifier in the engine compartment.
Rerouting this wire, as follows, will correct audible engine noise in the radio:
NOTE: DO NOT GO OVER .3MFD capacitor or the ignition system will be adversely affected.
Article ID: 80
Created On: Fri, Jul 4, 2014 at 8:16 AM
Last Updated On: Fri, Jul 4, 2014 at 8:16 AM
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1966-corvette-service-bulletin-audible-noise-in-radio-chevrolet-with-transistorized-ignition-80.html