Not sure if you have the older cruise with several componets under the hood. The older unit should have a vacuum motor up on the intake manifold with a control unit on the fender well. That control unit would have the speedometer cable going to it.
If you have a newer one, it should only have a one piece unit on the drivers fender well. It's electronic and won't have a speedo cable going to it. The vacuum motor is built into the control unit.
If it's the mechanical (older) unit, you probably have a problem in the control unit and not the switch. I did the same thing on my 1983 SS Monte (replaced the switch only to find it didn't work). That mechanical control unit is a piece of junk and very expensive to repair. It's likely that your problem is there.
I have manuals for both types of cruise controls and have worked on them both. If you give me more info, I can help you further and even scan in a diagram or trouble shooting chart and email it to you.
Let me know.
Alan
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1988 IROC-Z (T-Top)
5.7
Flowmaster Catback Exhaust
Subframe Connectors
Lakewood Box Steel Lower Trailing Arms |