Can anybody help me out? I have a dx99v that is getting engine or alt. noise. I have grounded everything I can and I still have it. It even has a mild hum when the engine is off and acc. is on. I've unhooked the ant. and it is still there so I dont believe its that. The thing is, I only have it with this dx99v. My other radio's don't do it. Any advice would be appreciated. Thank you.