With little else to do this morning I have drawn up the following circuit diagram

http://imgur.com/skP9N

It should only be used as a guide! The important things to note are that the solid state relays are polarity sensative. Make sure that the negative pole goes to the negative connection on your batteries and same with the positive. You won't damage the relay if you hook it up the wrong way around but you will instead have a weapon system that will fire up when you put the removeable link in (not recommended)