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Hey guys, I'm installing a new aftermarket head unit (nothing fancy, JVC KD-R330) in my '91 SE and got started this evening. I've got the proper wiring harness adapter from Crutchfield and just realized that I need the "diversity" antenna cable adapter (just ordered). I'm a little confused at this point, though. I pulled the OEM premium Sony CD player and there was a 6-pin round plug for the amp wired in to the factory stereo harness. I've installed several stereos over the years, but this is like alien-cockpit stuff to me. It kind of looks like a factory afterthought to offer this option and they kind of threw together a solution, resulting in some strange factory wiring (I don't believe this area has ever been opened up before on the truck). I'm planning to bypass the factory amp and also install new speakers front and rear, but what I noticed in there, and what is confusing me, is that there seem to be two harnesses for the rear speakers going into the main wiring harness. There is the one that was attached to the OEM Sony CD player, which had the 6-pin amp cable wired in, and that runs up and into the main harness and disappears, and there is also pretty much the same harness coming out of the back of the amp, which also runs up and into the main harness. There is also a 2-pin plug that was not connected, though both male and female ends are present and one end is wired into the OEM stereo harness (I think these control cig lighter light and heater control lights?). I will try to take some pics tomorrow to illustrate better, but I'm thinking that I need to connect the harness adapter to the rear speaker plug that comes out of the back of the amp? Or should I use the one that was originally plugged into the OEM stereo? I read through every post I could find here and also the how-to in the "garage" section, but most of them seem to pertain to dual-amp Clarion units in later (1995) models. If anyone has any 1991-specific experience, I'd be super grateful.