Memphis MC500D Amp problem

hey guys,

I have a memphis mc500d mono amp, and up until last week it's worked flawlessly, last week i changed my kicker L5 10" out for 2 xtant 10"s(the kicker was sounding terrible) When I hooked the xtants up, I ran them parallel, the next day or so the amp started shutting down with the fuse fault light coming on, I could usually turn the volume down and the subs would start playing again(fuse fault light would of course go out), this evening I was going over all my wires to make sure everything was connected right, and the light came on and is permanantly on now, I don't have a manual now nor did I when i bought the amp new last year.  Just from experience, can anyone point me in the right direction as to what might be causing this issue?  Just off the top of my head, i'm thinking the amp wiring is 4 ga from battery back to a 1 farad  cap, then 4 ga from there back to a distribution block and 8 guage off the block to the MC500D, the other side of the distribution block has an 8 ga wire going to a Memphis PR200.2 that's running my mids and high's...any help would be greatly appreciated!  Oh btw the xtants are single voice coil 4 ohm speakers.

4 gau and yea it's a good ground, but i will re-check today.

Well son of a gun, you're right azznboi, it is 500 x 1 @ 2 ohms, since I don't have a manual I was going off the power reference numbers, didn't pay attention to the Class D amp, not sure, mine is an 05 model, it's chrome, not black looking and the logo is on along one edge, maybe mine's an 04 model I can't remember now, but I bought it mid year last year tho i do know that for a fact, cause I had to buy a new amp after all my stereo stuff was stolen out of my truck as it sat on a dealer's lot being repaired.  HAHA maybe the kicker was a dual 4 ohm speaker then I was thinking it was a dual 2 ohm, but maybe it was 4 ohm, i'll have ot look when I get back to the shop monday lol.