I know the 2007 Dodge diesels came from the factory with them. Did the dealer install one from Dodge or an aftermarket one from Banks or ??
I'm not very familier with these but others on here have them and may be able to help you. Perhaps if you can find out the manufacturer they would also be able to help you trouble shoot it. My first gut reaction would be to check all the power supply to the unit/switch. It may be something as easy as an inline fuse.
Sorry I can't help more, hopefully some others will chime in soon.
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