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It is a solenoid, https://www.amazon.com/gp/product/B000Y82X4E/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1.
Mountainers - Yes I have factory aux switches. I plan on running the wire from the aux switch to the low voltage post to activate the solenoid.
I am going to run power to the rear of the truck and want to run it from the HAPP then through a relay that I will connect to an aux switch. I have a 2023 3500 with a 6.4. I am looking for a place to mount the relay and am not seeing any obvious area in the engine compartment. I have seen a...