I have a Becker Mexico, that I want to replace with a cd player+amp but I can't find a good wiring diagram to figure out what goes where, or where to put my amp. There's a big thick gray wire that on one of the wiring diagrams I looked at said it was for the amp, but it was hooked up to the becker radio and I had to cut it to get it off. I really have no idea what I'm supposed to do, with other cars I've had all I had to do was plug the plugs into the right slot. Any help with this would be greatly appreciated.

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75 300D, 6525 Miles
89 Jeep Cherokee Pioneer, 285,000 miles