Ok got all the speakers in and hooked up the head unit and only the tweeters worked. The amp came on with power but isntantly went to a fault light. This is is what I checked, i made sure the power and ground wires were correct, the speakers wires were on the correct poles. It was a new amp, 600w subs were 8in pyles beleive they are 400w.

The only think i can think of is the amp was in cabin and I was running 8ga wire, so from there to battery is probably 10-12 feet maybe it was to long for it.

ANy other ideas.

the length isnt the issue there. i would have to think a wiring issue

yeah I dont know the blue LED light came on in amp and the book said something with connections. I double checked everything. I didnt have the ground directly to the block, but that shouldnt have mattered.

The inline fuse seemed kind of flimsy and the wires inside it seemd to be barely scewed in but they were screwed in

That's probably a little light for the power wiring but that shouldn't cause it to instantly go into fault mode.
Does it instantly go into fault mode with NO speakers connected?
Check the voltage at the end of the power cables where your hooking the amp to or try hooking the amp up temporarily right next to the battery - SHORT cable. That could rule out or in your long power run.

yeah true, it flips straight to fault. My thoughts that the wire might be small but its should work the amp book even said 8 ga would work. I guess I can try it closer to the batter thats an option.

Fault light are usually due to the amp shorting or nOt enOugh batt to supply the power. Was the motor on? Batt charged up? Do you have to much hooked up to amp and it can not perform at that ohm load? Turn gains all the way down and see it stays on.

Battery was new and charged the battery switch was set to both and engines were off. Its a 600 Watt amp, subs were 8in 400w a peice. I had the gain set on low and nothing, then put it mid way and still nothing. The amp should handle those two speakers fine. I guess re-check the wiring, if thats good maybe it a chity amp

Where is yOur ground at? You said tweeters wrk whatare they hooked up to

i used ground on the battery, tweeters are hooked to the deck.