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Hi my name is Robert...
Normally the pump will be outside could be passenger side under the front engine access straight down, in back of the step or in the chassis. IF the room is making NO noise at all make sure the parking brake is set, the engine is in park and you have good battery voltage, some only run on house power and others run from the chassis battery voltage, so start the engine and check your voltage, go to the battery as well and follow the cables and make sure you do not have a breaker tripped, below is a picture, as a general rule they will stick that 18" from the battery and most have a tiny tab on them that will pop out when they trip. IF the room is making a noise follow the noise to the pump/motor.
IF you have more questions or concerns please feel free to contact me..... Robert
Hi... Was just checking in to see if my answer helped? IF you have more questions or concerns please feel free to contact me.... Robert