As you know, I've got a 1990 Toyota Camry, and seeing as I don't have enough money to buy a head unit, I'm using the stock stereo system. What I'm trying to do is wire up an amp to it, and seeing as the stock stereo doesn't have RCA cables (that I know of... could have them??) I'm using my amplifier's 'high level input' from the car's speakers to give it the signal. Thing is, the speaker I've got the high input on (the one that GIVES the amp the signal) stops giving the amp the signal when it's connected, and the other rear one (not connected to the amp) cuts out sometimes, leaving the front two 3 1/2" speakers to do the hard work. The amp shows a green light meaning "okay", no warning lights are on. The amp gain has been all the way down, mid way, all the way up, and in between those, and nothing fixes the problem. Any help would do (adding resistors to wires, changing fuses to different types, etc.). Here's how my setup is done:

Power--
10 Gauge Power Wire (approx 10') to the Battery with 30A in line fuse.
10 Gauge Ground Wire (approx 2') to the bolt holding the seat to the frame.
18 Gauge Remote Wire (approx 1') from power terminal (on amp) to REM terminal (on amp)

Fuses--
1x 30A In-line fuse (in tact); wiring kit uses 20A (225W wiring kit)
2x 25A Amplifier fuses (in tact); amp uses 2x 15A fuses normally

Speakers--
16 Gauge Speaker wire (bridged for 550W output) running to Subwoofers (1000w e/a)

Input--
High-level input connected to Rear-left speaker via 16 Gauge speaker wire
(the rear-left speaker powers both R+, R-, L+, and L- high inputs on the amp)
Black Ground wire on high-input cable is disconnected.

Amplifier:
Scosche 550W 2-channel amplifier

For those of you who are dyslexic or just visual learners, here's what my setup looks like (as described above)

ok well ur problem sounds easy enuff
1st off, dont wire the high-levels all into one speaker, wire the lefts to the left and the right to the right
but the reason your not getting any sound is that you need to connect the high-level ground, its there for a reason
when i was using my high levels i just took the high level ground to the amp ground and ot all worked fine
also i dont know if i'd recommend using larger fuses in the amp then what came with it, they're designed so that the fuse blows b4 the amp does, and if u put larger ones in you may blow the amp and not the fuse
i hope this helps

Thx, I'll try that sometime. I'm gonna put in a new head unit before I try the amps again. I find that RCA's are simply easier for me to use (gee.. wonder why...) I've tried grounding out the ground wire to the amp ground, but that doesnt do much, it works better actually when I put the ground on the L-;R- wire of the high input. But now, on the Scosche, that doesnt even work. I bought a high-level to RCA adapter, but it needs a tiny screwdriver that doesnt come with it, and... yeah the wires dont stay unless you do it up with the screwdriver. Oh well... Like I said, I can wait... I hope...

Neither of the amps (my new 1000W MA Audio amp, and the 550W Scosche) show protection modes, so the high level is probably most likely the problem.