Install aftermarket stereo
 

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My wires that remain.
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I have like 4 green wired left .
I got wiring diagram from forum sights and sounds for my 99 Blazer. Color codes don't match . I went through them all but none of them match my wiring I have like three green wires left and I don't have two yellow ones like the wiring color codes say I should can anyone please help me. And I believe I have 6 speakers in my Blazer and the color codes only tell you left rear right rear left front right front what about the middle speakers how do I connect them any help I would appreciate here thanks

Here are the wiring diagrams for the radio with and without external amplifier, since I don't know which you have. Hopefully, that will help you figure it out.

Thank you for the info. I will check it out...