Cruise control shows power on but will not turn.

You need to post the make and model of your car.

Generally if the cruise control light is on, on the dash indicator then the problem is in the steering wheel electrical connection.

Then internal wiring connecting the steering wheel cruise control switch is connected to the dash by a special wire called a clock-spring ribbon. This is located under/behind the steering wheel. It is not a self service repair item and required a good deal of expertise to repair. Sorry, but you will most likely need to take it to a qualified mechanic. Because the steering wheel also contains an airbag, do not attempt to do this repair yourself!!!

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Hello
I answered this once but I would like to add the problem may be related to the rotating coiled drum ribbon contact under the steering wheel that connects the cruise button to the trucks wiring, it may be broken, it is called the clock spring contact and it supplies a connection to all steering wheel mounted switches and the airbag.

are you going uphill in overdrive gear . If the speed is lower than you set the crruise control might disengage. ?

first ck fuse for cruise control,if ok ck power to main switch use a omp, amp meter for test, should have battery voltage to and from switch when in on position. if ok your next ck is steering wheel switch. air bag must be removed unhook battery wait five minutes remove airbag hook battery up ck steering wheel switch if ok below steering wheel is cable reel ck yellow connectors on both side for power if all have power to and from go under hood and ck power to cruise unit if ok pcm may not be letting it come on because of engine or trans readings dtcs pending or set can shut off cruise control

Your brake lights and your turn signals go through the multifunction (turn signal) switch. It is common for these switches to short internally. Partial disassembly of the steering column is required to replace it. The airbag stsyem must be disabled, then the airbag removed from the steering wheel. Then the steering wheel must be removed to access the screw in the front of the switch assembly. The rest is pretty easy... a few screws holing the lower cover of the dash, the shroud around the steering column and a few connectors to deal with. (see pictures of switch assembly below)
There are two types of these switches available for 2000 S-10. With cruise control and without cruise control. The one WITHOUT cruise control is much more expensive!

There is fuse but it is a shared fuse called the "meter" fuse. If that was the problem then your turn/hazard lights and instrument cluster would not be working either. Could have a problem with the main switch or clockspring which allows signals to go thru moving contacts of steering wheel. Check to make sure the Cruise control actuator electrical connector up under the hood has not come loose or been left disconnected fromo prior repair.

With the car turned off and the battery disconnected, root around under the dash and find the wiring harness that comes down from the steering column. You may have to remove a dash panel or two to get at it. It should be connected to the car's main wiring harness with a plug of some sort. Disconnect the plug.

Using a multi-meter set to test continuity, test pairs of pins in the connector from the steering column, pressing the CC switch with each pair, until you find the pair that come from the CC switch.

Isolate the wires for these two pins behind the plug and scrape away a tiny bit of insulation with a knife blade, being careful not to cut through the wire. Test the wire pair again to be sure you've got the CC switch wires.

Cut the wires, leaving several inches of wire above the plug to work with. Using a good quality crimp connector (or soldering, if you know how and have the equipment), connect the two wires you just cut loose (the two coming from the plug, not the steering column).

Make sure there are no bare wires *anywhere* when you're done. Cover everything with heat shrink tubing or electrical tape, then use a tie-wrap to bind all the wires together again. Return the wiring harness to where you found it and re-install any dash panels you had to remove.

Reconnect the battery and go for a drive. The CC switch will be totally out of the circuit, but your CC should be permanently turned on.

Now here's the fun part. You'll have an extra momentary-contact switch on your steering wheel that's not doing anything. Just think of the possibilities... You could use it for an auxiliary air horn like on a semi-truck, or you could wire it into your brake lights so you could screw with tail-gaters without actually stepping on the brakes. Look for the switch somewhere on your brake pedal assembly and add two wires from the old CC switch to the contacts on the brake pedal switch.

Check for a relay.

most likely the clock spring is not the problem because when u push the button the dash light cruise comes on.wich means that you do not have an open circuit.with a light tester check to see if you are getting power to the cruise control servo.if you are then replace it.if no power you will need a new cruise control stick on the steering column.