Ok, so I went ahead and installed an aftermarket alpine headunit. I purchased a premium wiring harness from Best Buy and everything sounds great. Only issue I have is a load THUMP when I turn the key. It is coming from the factory sub. I have a Ford explorer sport trac that came with the premium sound sytem. Everything works fine including the sub. Anyone have any idea what would cause this?
No announcement yet.
Loud thump on start coming from factory sub