It can be faulty cruise control switch. If the switch is replaced, then it can be wiring issue or faulty cruise control board. But as the switch is replaced, get the voltage at the switch tested to confirm the switch is actually receiving voltage. If no voltage received at switch power supply wire then, apply external 12 volt power to the cruise control switch wire and then see if cruise control comes ON. If yes, then you know wiring is issue.
On this case, to troubleshoot this problem, there are solved help links. Click the link directly and refer the details to solve this problem yourself, with help of diagrams: ------
CRUISE CONTROL http://alltypesofpartsreplacing.blogspot.com/2012/12/cruise-control-not-workingcruise.html----------These will help.Thanks.
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