Wiring problem

I have a 2011 Tacoma and I upgraded my stock radio with an aftermarket unit. I started removing the stock unit and I noticed a cluster of wires spliced in the trucks OE harness very close to the connectors.i removed all the extra wires and connected everything back to stock as best I could. New radio is installed but I hear a cracking sound when I turn it up slightly. I've been told it's a ground problem but how do I know which wire to look for in the harness? There are several black wires in the 3 different connectors. Can I get a new OE connectors with leads so I have room to get more wire to splice in?

 

Toyota sells "theft kits" for their vehicles however I've never needed one for a second gen. Theft kits come with any necessary brackets, screws, and wiring harnesses with about 8" of wire coming out of the plugs.

 

Thanks! I might just go that route. Just so I know that connections would be better.

 

Metra, Scosche among others also makes a plug/harness.

https://www.carid.com/2011-toyota-tacoma-wire-harnesses/

 

Are you using an aux chord , or Bluetooth?

 

With the stock radio I used an aux cord. The new head unit is Bluetooth and I have the adapter box for it.

 

Ok, so are you using BT or Aux?

I’m asking cause an aux being bent at a certain angle while plugged makes a scratchy noise sometimes or sounds like a speakers blown..

 

The new unit is Bluetooth.

 

Yes