So i have got the most god-awful engine noise in my system. I have grounded the head unit replaced my rca's with 150 Fosgates. they are all alone in the install. I have a kicker 250.2. Some Polk Momo components, 2 Alpine type R's and a Fosgate 800.2. This system has a cap everything. This is the second one I have put in this car and probably the tenth I have installed on my own.
The noise is not related to the engine. Because when I turn the car on, with the hood up, the fan that keeps the fuse box pressurized comes on. I think that it is the same whining noise the fan makes, any help would be great. I also installed ground loop isolators can't shake it.