Amp comes on but no sound to the subs and i think i checed all wires and even got new rcas

several things can cause unwanted noise, poor ground, reversed directional rcas, rcas routed too close to power wires, gain turned too high, defective amplifier or h/u(deck),
if your amp is grounded to the body, the size of the body ground at the battery must be increased larger than the amp ground.
check the outside sheathing on the rcas, look for an arrow. it must point from the h/u.

There are several things that you can check for this issue:

Check that the remote turn on wire is connected.
Check that the RCAs from the stereo are connected at both the amp and the sub output of the stereo.
Check the stereo; some head units have settings for the sub output. You made need to set the sub output to "on" at the stereo.
If your subs/speakers are in a box, check the connections there.

Sounds like you have no signal going to the amp. Check th RCAs.

amp might be bad try switching the rcas around

You have to be more specific. Subs thump, that is their purpose. You need to be more in depth about the sound, because it sounds like the subs are doing their job by thumping out bass

un hook the subs and let the amp sit there on if the protect light shuts off you wired your subs wrong if it doesnt go off tun it off then back on with no sub music all the way down then slowly turn the music up if the light is off then comes on you need new rcas

either the rcas arent outputting the audio signal or you have a bad se tof rcas. An amp is obiously not your issue in this case.

There are a couple of tests you can perform. I'd first recommend checking the shield ground. You'll need an ohm meter. The details can be found on the following page.

RCA shield ground test

You can also test the output with the multimeter. Set the multimeter to AC volts. If it's not an auto-ranging meter, set it to a voltage range of ~2v AC. Disconnect the RCA cables from the head unit. Touch one meter probe to the outer ring of the head unit's RCA jack. Touch the other probe to the metal contact in the center of the RCA jack. With the head unit near full volume and a clean signal source, you should read at least one volt on musical peaks. If you have a bass disc or a test tone disc (~60hz sine wave), use those.

If it does it with no RCAs plugged in, the speakers or wiring need to be checked.

If the speakers and wiring are OK, the amp may have shorted output transistors.

Check you pre amp RCAs and make sure they are holding a voltage...this is where the Amp takes that signal and amplifies it...without this connection the amp will not produce any power.