make a small slice in the actuator cable close to the unit, and see if the wires are bare or have severe damage from engine heat destroying the insulation, when you buy a used actuator you likely are getting on in as bad shape as the one you are replacing, if the used one was working on the donor engine it is likely that once it is removed, the wires if they are burned will move and eventually touch, if they do they could eventually cause damage to the cruise control/ idle control module.