I bought a used 05 Excursion Limited. It works great until recently. A couple weeks ago we realized the speaker from the rear door back were sometimes not working. They are no longer working at all now. I was thinking about chasing the wiring harness for shorts or loose plugs, but I am not sure where to start. Any advice would be appreciated. Help please!!

 

yeah don't be afraid to pop off some panels and follow the wires. check your power(red) your ground (black) and the wires from radio to speakers (usually green or purple or brownish) it might be just one wire gumming up the works usually the ground