Hello- The cruise quit working and I was thinking about replacing the cruise control relay to see if this is the problem. Can anyone tell me where this relay is located exactly? Is it a 4 or 6 terminal?

I'd check your vacuum lines first for a disco'ed vac source to the CC diaphragm on the passenger's side near the firewall.

Do you have the CC switches on the steering wheel? I forget when those became available. Sometimes the contacts inside the steering wheel get corroded or dirty or just plain wear out and don't let you set the CC any more.