radio wiring

I just bought which I still feel was a great deal, this Buick with 148,000 miles. From a couple in their 70's. One owner and garage kept. They said the radio didn't work and their son pulled the fuse because of battery issues. Well I found out why. I put the radio fuse back in and by morning my...

I cannot afford the wiring harness I have seen in previous posts. I am wiring my aftermarket radio to my 2000 park ave ultra hard wired. Does anyone have a wiring diagram for the radio wires or know what each of the 21 wires goes to?? Any help would be appreciated. I know I could do a trial...