Hello everyone. So I am in the middle of installing some new radio equipment into my 1988 vette and i am having some difficulties. For some background, I have the Bose system in my car, but the previous owner took out the Bose head unit and put in some junk pioneer one and left the Bose speakers with their individual amps. The result was more functionality but the sound quality is nothing short of horrific. So, I decided I do not want to run new wires, but i want to replace the factory speakers and install a more period correct head unit, with a cassette deck i could use an aux adapter on. Ultimately I decided on a delco non Bose radio out of a 1996 Chevy truck and 4 Rockford fosgate speakers, 4 inch up front and 6x9 in the rear. When i opened up the rear speakers i found their were 4 wires running to the rear speaker. On the left was a yellow, brown, black, and a pink/red i will call red. A google search told me that the brown was positive and yellow was negative and the other two were for the amp. So i spliced the yellow and brown onto the new 6x9 and left the other 2 alone. Then, i hooked up the new head unit, and had the clock, and power antenna working perfectly ( though i need an adapter from the large antenna prong to the small socket on the new head unit). The passenger front speaker has long stopped working and i had not replaced either door speaker yet, so i was expecting to hear the crappy driver speaker and the nice new 6x9s in the rear when i turned it on. Instead......only the door speaker worked. No sound from either of the new rears. So I broke out the multi meter and measured voltage across the speaker terminals in the rear and it read 0 volts. So, i figured maybe i got the wires wrong and wired the black and red wires into one of the 6x9s instead, which got me only static, but about 12 volts across the terminals. So i tried plugging one old speaker back in in the rear and it worked normally! Horrible quality, but it actually played music. Was able to read a varying voltage across the terminals as the music played. So then I figured maybe i need to connect the red and black to complete the circuit and trigger the other wires for the actual audio signal. Well.....the radio was on for about half a second and went dead. The fuse in the passenger side box appears to be intact so i fear i shorted out the head unit and now am out another 100 bucks. Great. Any ideas on if i could have popped a different fuse? Everything else still appears to work but the radio does absolutely nothing, no clock no power nada. Also, why can i not get my rear 6x9s to work? I read on one thread that someone just plugged in the yellow and brown wire and they worked perfect with their new head unit. Do i need to tie the two positives and two negatives together and then attach to the speakers? Do I need different speakers? I have had good luck with RF in the past and I really do not want to run new speaker wires altogether, I just installed brand new carpets and dont want to pull them up for the speaker wire. Thanks!