I m using a linear acuator as a power steering rack for a remote control hotdog cart I built ( search YouTube "remote control hot dog cart" it comes up 1st) I used a dual relay switch (http://www.robotmarketplace.com/products/0-TD-RCE220.html) to control the steering. It works but after a while the stealing goes out of adjustable range. This is what the actuator / wiring look like (http://www.servocity.com/html/25_lbs__thrust_linear_actuator.html). I didn't use the 3 wires white,blue,Yellow because I really had little to no clue what I was doing. Can what I'm using be salvaged or is there a better way/ controller that will handle 12 volts and be able to plug in to a servo reciver?
Don't laugh at me it was my first time tring anything like this
Can what I'm using be salvaged
Sure. You could send it to me, and I'd find a use for it.
If you mean can it still be used, the answer is yes.
I didn't use the 3 wires white,blue,Yellow because I really had little to no clue what I was doing.
Well, now you do, and you should be using them.
and be able to plug in to a servo reciver?
It isn't a servo, so, no. Connect the three wires like a potentiometer, with the blue one going to an analog pin.
Get the speed controller on the page you linked, to be able to control the speed of the actuator, and use the potentiometer output to know when to stop.