Hello,
What are your voltage readings for those two wires at the control panel?
You may have bad wiring, a bad control module (the control panel for the driver), or one wire may be for the stop position of the servo motor.
If you have 12v for both wires all the way to the control module, you can probably guess the control module has a fault.
If you connect the battery to the actuator, does it only move one direction and stop, or does it continue to attempt movement?
Does the actuator have a ground to the chassis, or is this a 2-wire actuator (servo)?
Thanks for replying casey40510 - I replyed earlier but it didn't go through.
I connected 2 of the actuator's to the battery and they just keep turning. they will go in both directions if I switch wires around.
There is no ground wire on the actuator's. I tried to find a wiring diagram for them but did not find it. I was thinking it was the module so I bought a reconditioned control module from the auto parts store and I don't believe it was any good cause it wouldn't even turn the AC on. I am trying to find a used one just to try it. All 4 actuators have 12v on both wires going to them.
What you are call the control module is the knobs that control Fan, Temp & vents?
Yes, the A/C heater control module is the panel in the cab with the control knobs on it.
Test it.
When you change from recirculate air to fresh air, the motor on the far right should receive reverse polarity. In other words, the positive and negative are changed depending on which direction the motor needs to go. You have already established 12v at the motor, but what is it leaving the control unit.
You will have to do some fishing around, but ground one side of your multi-meter to the chassis, confirm it is a good ground by using a fuse to provide positive 12v, and start probing to see if you lose power completely when the switch is changed. One, and only one, of the wires on the module should turn negative.
Let me know the results, as this will tell you if the control module has failed, or if there is an issue with communicating the signal.
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Thanks for replying casey40510 - I replyed earlier but it didn't go through. I connected 2 of the actuator's to the battery and they just keep turning. they will go in both directions if I switch wires around. There is no ground wire on the actuator's. I tried to find a wiring diagram for them but did not find it. I was thinking it was the module so I bought a reconditioned control module from the auto parts store and I don't believe it was any good cause it wouldn't even turn the AC on. I am trying to find a used one just to try it. All 4 actuators have 12v on both wires going to them. What you are call the control module is the knobs that control Fan, Temp & vents?
Yes, the A/C heater control module is the panel in the cab with the control knobs on it. Test it. When you change from recirculate air to fresh air, the motor on the far right should receive reverse polarity. In other words, the positive and negative are changed depending on which direction the motor needs to go. You have already established 12v at the motor, but what is it leaving the control unit. You will have to do some fishing around, but ground one side of your multi-meter to the chassis, confirm it is a good ground by using a fuse to provide positive 12v, and start probing to see if you lose power completely when the switch is changed. One, and only one, of the wires on the module should turn negative. Let me know the results, as this will tell you if the control module has failed, or if there is an issue with communicating the signal.