Need help with wiring

[Goudy76]

So i just hooked up a new deck and now when my truck is running my sub hums at the same engine note. Truck revs and the sub humms in a higher frequency etc. And when the truck is off it bumps like a heart beat. What is the problem.

Click to read more...

 

[Boomin_tahoe 5,000+ posts]

Sounds like a bad ground.