So I took the stock tape player out, put in a stock cd player, took out cd player because none of the back lights work, put stock tape player back in.

Now the brake light (dash) blinks constantly and the DRL's don't work. I googled a bit and found to check the ign fuse and DRL fuse in the engine bay and both were good. I also swapped the horn relay with the DRL relay and the horn still works. I check all the fuses in the engine bay AND the passenger compartment.

What am I missing?