Hi guys, first off, im a Master Ford tech of 27 years. So, im not a beginner. BUT, i have a problem that is kicking my butt. I have a 2013 C-Max that i installed a self amplified Bazooka bass tube in. These use either a high level input or line level input. So, i tied into the rear door speaker for the high level input. Battery power is directly to the 12v battery and grounded right beside it on the chassis on an open ground location. I have also wrapped the high level wires in Faraday tape. Every time the car transitions between gas and EV and EV to gas, i get horrible feedback. Bad enough it sounds like it could blow the sub. Has anyone else had this happen and if so, why?