Measuring Voltage 2 Battery Bank

Hi i'm having problem measuring the voltage of the 2nd bank. After the connections of the schematic I made, wire became hot and soft because of the heat after doing the schematic.. I know I'm doing this wrong.. Can you help me guys with the proper connection? Thank you.. Im using 16 batteries in parallel lithium ion rated 4V and 2250mah..

why not keep this thread going?

I think Crossroads answer might have something to do with it!