96 dakota not starting

i have a 96 slt v8 dakota im trying to fix myself. it wont start. put new batt. new starter motor. it just clicks engine wont turn everything in truck is working but when i turn the key to start its just clicks and my radio losses power. so i took out radio and still wont start any help please

Here is a diagram. Starter motor relay or fuse would be my guess.

I dunno if it’s relevant to a 96 but my 2007 with V8 will not start sometimes if I feed it low grade gasoline.