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I am having trouble locating the relay for my AC. Any help would be appreciated. My truck 2006 Ram 2500 deisel quad cab 2wd.

Thanks,
Rob
 

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Some vehicles now have a solid state relay (transistor) instead of an electromechanical one. It could be inside a computer. If it's a discrete relay, it would be in a power distribution box underhood, where the maxifuses are (40 amp and up). The lid of these boxes has a diagram showing which relays are which.
 

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The newer vehicles use a TIPM (totally integrated power module) for smart power management instead of the old PDC (power distribution center). You may need a scan tool to read why something has been 'turned off'. It is usually to protect the circuit, i.e.- like a detected short, if the A/C compressor circuit has been disabled.
Is the compressor not coming on?
 
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