ive been trying to hook up an amplifier in my buddys 2004 f-150. its the new body style. the problem is there is some kind of hissing sound coming out of the sub when i hook up the line converter to the stock wires in the truck. disconnect the wires and the sound goes away. its not alternator whine. ive done this type of hook up many times and its always worked in the past. did ford change anything in the new body style? he is going to use his stock head unit. any suggestion, comments ? ive searched the forums and not found my answer. thanks in advanced

 

I had same problem when I added an amp to my audiophile hu.I moved the loc away from the hu and climate control unit and that did the trick.

 

I had the same problem, I used 2- 2channel lightning amps, I removed the amps and bought 1-4channel alpine amp and the noise is now gone! I also have 1 mono kenwood amp running my sub and it all sounds great. I have a 2004 screw.

 

Ive heard that having your amp ground wire being too long can cause that whining sound. Most amp manuals suggest you keepe your amp groung shorter than 18 inches. If this is you, try trimming it down to a foot. I know it doesnt leave you much option, but youll find a ground..?

Just keep touching that power wire on stuff til you get a SHOCK!! lol

 

actually, just the opposite ...too short of a ground cable, can cause problems as well. What happens, is you form what's called a ground loop between the amp ground and the head unit ground. This can be solved by running the sround of the amp up to either the battery - or to a ground near the head unit.

 

Or run a ground wire from the chassis of your head unit to the amp to eliminate the ground loop...