One of the best things I did on my truck was add a manual button. All you have to do is take the white wire off of your controller and put some electrical tape on it. Then put a new wire where the white wire used to go, run it in the cab and attach it to a momentary pushbutton switch with two terminals. Hook it to one of the terminals and then run a short wire from the other terminal and bolt it to a good ground under the dash. That's it.
You can watch your voltmeter in the dash, when you are glowing the plugs, the voltmeter will drop way down to around 8 volts or so. Just start experimenting with how long to hold the button in. I would not hold it on longer than 10 seconds, I usually hold mine in for 5 or so, depending on how cold it is, and then if it doesn't start I just stop cranking and hold the button in a little longer and try again.
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