Supporting Vendors / Dealers - Advertising - Shop

1965 - 1972 Corvette: Service Bulletin: Moisture Entering Pulse Amplifier - Transistor Ignition Systems

Subject:   Moisture Entering Pulse Amplifier - Transistor Ignition Systems
Model and Year:   1965 - 1972 Corvette
Source:  Chevrolet Dealer Service Technical Service Bulletin
Bulletin No:  68-T-8
Section:   VIy
Date:  Dec. 19, 1967


The most common cause of transistor ignition pulse amplifier failure is moisture entry into the amplifier past the back cover seal or the connector coupling area.  Moist air can be drawn past minute gaps in these seal areas as a hot amplifier cools and creates an internal vacuum.  Over a period of many suck heat and cool cycles, enough moisture may enter to cause circuitry problems and render the ignition system inoperative.

A wider cover seal has been used in 1967 production amplifiers, and effective with November production, a non-conductive silicone grease is being used to pack the harness connector cavity approximately one-half full and effectively seal this area.

It is recommended that the harness connector be packed one-half full with Dow Corning Silicone Grease (or its equivalent available locally) whenever a transistor ignition equipped vehicle is being serviced.  If transistor ignition amplifier moisture problems are encountered, the unit should be serviced as outlined on page 1 of the November, 1966, Service News and the harness connector should be packed.

0 (0)
Article Rating (No Votes)
Rate this article
Attached Files
There are no attachments for this article.
There are no comments for this article. Be the first to post a comment.
Security Code Security Code
Related Articles RSS Feed
1965 Corvette: Engineering Service Letter: Temperature Gauge Reading Too High
Viewed 738 times since Wed, Nov 26, 2014
1966 Corvette: Service News: Wiring Diagrams for Breakerless Ignition Systems
Viewed 1793 times since Thu, Sep 18, 2014
1966 Corvette: Service News: Corvette Radio Speaker - Replace
Viewed 955 times since Wed, Jul 2, 2014
1982 Corvette: ECM Codes
Viewed 1279 times since Fri, Aug 1, 2014
1973 Corvette: Electrical Schematic: Mono and Stereo Radio System
Viewed 1332 times since Sun, Jul 13, 2014
1982 Corvette: Service News: Fuel injection Diagnosis Chart
Viewed 1592 times since Sun, Oct 5, 2014
1971 Corvette: Service Bulletin: Anti-Diesel Relay
Viewed 994 times since Sun, Feb 8, 2015
1965 - 1972 Corvette: Service News: Ignition Pulse Amplifier (SN-C-1)
Viewed 979 times since Thu, Oct 2, 2014
1965 Corvette: Service Bulletin: Power Windows - Special Policy
Viewed 681 times since Sun, Nov 2, 2014
2006 Corvette: Electrical Schematic: Wiper Washer System
Viewed 502 times since Mon, Jul 14, 2014