Amp Will Not Stop Overheating

You say you have 2 p312d2 subs. Ok so the d2 stands for dual 2homs (2 X 2homs voice coils per sub) , conecting in parallel the 2 voice coils of only one sub will create 1hom load to the amp, and if your amp is 2homs stable per chanel that means you are lowering too much your homs causing the overhwating to it.

Your wire are to small going from speaker to amp and batteries to amp is and should be smaller then your ground get better wires .and first start with upgrading the wires from woofer to amp them get a bigger gage ground and watch the dif..

Wire them to 4 olm and start with turning gain down a bit and see if it still turns off. Sounds like your running an unstable olm load

I think your amp 400watts rms per channel. is your amp mono? if it is mono and you have 2 subs hooked up. i think your subs are 500 rms each then the amp is working to hard and does not support for 2 subs you need 1000 watt rms combined or 500rms x 2 channels @ 2 ohms. so 1000 watt rms mono amp @ 2 ohms or a 2 channel amp with 500 watt rms per channel @ 2ohms. im sorry but your amp dose not work i know it say 2400Watt max but you dont run subs on maxx all the time you need to look at rms watts per channel at 2 ohms

You can't have two DVC subs running at 1 ohm. They can only be wired to 4 or 1 ohm. If they are parallel wired they are at 4 ohm.