dual battery wiring

Ok here is my question. I have a 225 amp alternator installed in my 2000 Chevy Suburban. I am also using a 200 amp isolator solenoid with 2 brand new yellow top Optimas. My problem is that my second battery will not keep a charge and acts like isn't getting charged by the alternator. I had to hook up my charger to only the second battery last nite and will have to do the same thing tomorrow. I want to make sure that I have everything wired properly. I have the positve lead coming off the alternator going to my front battery. From the front battery I have a cable running to the isolator solenoid and then on to my second battery. I am using all 1/0 cable for all my power cable. I have even a negative cable running from my front battery directly to my rear battery. I have the isolation solenoid wired to a +12 volt source that is only on when the switch is on. I hear it click, when I first start the truck and when I shut it off. I want to know what is wrong and why my rear battery will not keep it's charge. The batteries were bought and installed at the same time. Do I need to run a wire directly from the alternator to the back battery as well? Nothing that I can find online gives me any help so I am hoping you can.

bberman1 - I don't listen to it hardly ever without the car running because I have a lot pulling on the second battery. I tested it like you said and it wasn't getting the same at the rear battery so I changed out the isolator. That still didn't fix it so I checked all my connections and it ended up being a loose connection on my ANL fuse at the front. I am using all Scosche EFX wiring products and I have had the same problem with all their ANL fuse holders. I am using the ones that have the 1/0 in and out, believe it is the PWFH2I Fuse Holder I tightened it down as hard as I could and it solved my problem. Thanks for the help though because without it would have never known.

Glad you found the problem