| Re: 84 auto corvette wont start. |
Subject: Re: 84 auto corvette wont start. by rayquayle on 2008/4/30 6:11:04 I mentioned testing the wires at the Theft Deterrent Starter Interrupt Relay, because I thought you had the DIC still out and had easy access to this area and would allow you to verify the Ignition Switch was working to that point without removing the Hush Panel and getting upside-down in the footwell. Yes,Theft Deterrent Starter Interrupt Relay is still in the path even with the security feature disabled. A relay will have one or more sets of contacts. Each set will have a common contact, a N.O. (Normally Open) contact and a N.C. (Nornally Closed) contact. With no power applied to the relay, there is continuity between the common and N.C. contacts. When power is applied to the relay solenoid, it pulls the contacts and the common contacts now have continuity with the N.O. contacts and the continuity between the common and N.C. contacts is broken. The Theft Deterrent Starter Interrupt Relay is no different. The power for the Starter/Solenoid comes from the Ignition Switch, through the Park Neutral Switch (this is why I suggested trying to start in N), and then through the N.C. contacts of the Theft Deterrent Starter Interrupt Relay. If the security system were operating normally and the system was armed and a tamper was detected, the system would blow the horns and energize the Theft Deterrent Starter Interrupt Relay. This would break the N.C. contacts which breaks power to the Starter/Solenoid. With the security system effectively defeated, it can no longer energize the Theft Deterrent Starter Interrupt Relay and the power can no longer be broken. But what if the problem was in the relay on its N.C. contacts. There is no continuity between the N.C. contacts due to burned/pitted/broken N.C. contacts. You could test this with the jumper between the Dark Green/White wire and the Purple (or Blue wire;thanks CC). You could also test for continuity between the N.C. contacts of the relay with a VOM on the bench, but you didn't say you had one. The only mention was a power tester. |
