Stereo install

My neighbor bought a 88 B2200 pickup for cheap. Stereo not installed, just wires and a couple harnesses laying loose on floor. I cannot find a way to connect, so I have to do it the hard way. Oh, no manual either. Can anybody tell me what these 7 or so wires are for?? Only one possible power (Red with black stripe), and the rest are blue with different colored stripes I believe. Please help if you can...pics if you have 'em.
Thanks a ton

Regards

Those are all the speaker wires you should have 8 total 2 for each speaker front and back. I just took them out and rewired the whole thing!! Also if the power wire is messed up you can run a wire to the fuse box then just bolt the ground to the screws below the radio. Not that hard to do just time consuming!