relay box on 2006 Dodge Ram 2500

can you tell me where the relay box is located on this truck? My husband has tried to locate it with no luck. a/c went out, he replaced the lowpressure transducer with no luck, fuses all test good.

Asked by for the 2006 Dodge Ram 2500
Do your husband a favor and get him a repair manual for this vehicle. Try for an online subscription. He will get wiring diagrams, component locations and diagnostic procedures, all of which a person attempting to repair a vehicle should have.
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it is under the hood on driver side next to the battery can you tell me how to replace the lowpressure tranducer im having the same problem also make sure the ac is charged