2001 Ranger A/C issue

OK so the A/C has a mind of it's own. Placed on Max A/C or just A/C at times it will come on and is very cold (suction sweating back and all)
will continue to function until I turn the ignition off. When I restart it will not work until IT wants to. I am not getting power to the clutch, I have bypassed the Hi and Low pressure switches to no avail, when tested they had no power running to them. OK so I need a schematic (where can I find one) and any other suggestions would be appreciated. Are the thermostat and switch (A/C, Heat and Defroster) electrical or vacumm controls?
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